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Kentucky - Science: 7th Grade
Academic Standards | Adopted: 2022
7-PS1-2: : Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
7-PS1-2: : Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
Chemical Changes
Chemical changes result in the formation of new substances. But how can you tell if a chemical change has occurred? Explore this question by observing and measuring a variety of chemical reactions. Along the way you will learn about chemical equations, acids and bases, exothermic and endothermic reactions, and conservation of matter. 5 Minute Preview
Chemical and Physical Changes - Middle School
The Secret Service recently arrested suspects accused of counterfeiting coins from 1915 valued at $50,000 each. The students act as a forensic scientist to investigate the crime scene and the evidence. Students learn about chemical and physical changes to recreate the methods used to make the coins as evidence for the trial. Video Preview
7-PS1-6: : Undertake a design project to construct, test, and modify a device that either releases or absorbs thermal energy.
7-PS1-6: : Undertake a design project to construct, test, and modify a device that either releases or absorbs thermal energy.
Feel the Heat
Have you ever used a glove warmer to keep your hands warm? How about an instant cold pack to treat an injury? In the Feel the Heat Gizmo, create your own hot and cold packs using various salts dissolved in water and different bag materials. Learn about exothermic and endothermic processes and how energy is absorbed or released when bonds are broken and new bonds form. 5 Minute Preview
7-PS2-2: : Plan an investigation to provide evidence that the change in an object’s motion depends on the sum of the forces on the object and the mass of the object.
7-PS2-2: : Plan an investigation to provide evidence that the change in an object’s motion depends on the sum of the forces on the object and the mass of the object.
Fan Cart Physics
Gain an understanding of Newton's Laws by experimenting with a cart (on which up to three fans are placed) on a linear track. The cart has a mass, as does each fan. The fans exert a constant force when switched on, and the direction of the fans can be altered as the position, velocity, and acceleration of the cart are measured. 5 Minute Preview
Force and Fan Carts
Explore the laws of motion using a simple fan cart. Use the buttons to select the speed of the fan and the surface, and press Play to begin. You can drag up to three objects onto the fan cart. The speed of the cart is displayed with a speedometer and recorded in a table and a graph. 5 Minute Preview
Free-Fall Laboratory
Investigate the motion of an object as it falls to the ground. A variety of objects can be compared, and their motion can be observed in a vacuum, in normal air, and in denser air. The position, velocity, and acceleration are measured over time, and the forces on the object can be displayed. Using the manual settings, the mass, radius, height, and initial velocity of the object can be adjusted, as can the air density and wind. 5 Minute Preview
Newton’s 1st Law: Robotics Showdown
In this standalone investigation, students act as robotics competitors trying to program a cart to stop at a target. Using the Force and Fan Carts Gizmo, they investigate how balanced and unbalanced forces affect the motion of a cart and see Newton’s First Law in action. By testing different surface types and fan forces, students learn how friction and applied force interact, discovering why objects stay at rest or in motion unless acted on by another force. The investigation focuses on motion, inertia, balanced and unbalanced forces, and friction. Preview
Newton’s 2nd Law: Speed Lab Challenge
In this standalone investigation, students take on the role of motion analysts using the Force and Fan Carts Gizmo to figure out which racer will win. Using the Force and Fan Carts Gizmo, they collect and analyze data to identify patterns between force, mass, and speed. Students apply Newton’s Second Law to explain why some carts accelerate faster than others, then use scientific evidence to justify which racer will win. Topics include the relationship between force, mass, and acceleration, and interpreting data to support scientific explanations. Preview
Newton’s Laws: Race to the Finish
In this three-part series, students become motion analysts using the Force and Fan Carts Gizmo to figure out which racer will win. They investigate how changes in force, mass, and friction affect the motion of carts, collecting and interpreting data to build and revise models. Students use their findings to deepen their understanding of Newton’s First and Second Laws and apply evidence to justify their predictions in a final race challenge. Core topics include the effects of force and mass on acceleration, the role of friction, and balanced and unbalanced forces. Preview
Tackling Concussions: Testing Helmet Design Using Laws of Motion - Middle School
Concussion rates in youth impact sports are high despite the use of helmets. In this STEM case, students act as materials scientists to learn about the physics behind concussions and helmet function. Students will use their understanding of Newton’s First and Second Laws of Motion to investigate helmet padding material to determine which material is best at reducing force during an impact. Video Preview
7-PS2-3: : Ask questions about data to determine the factors that affect the strength of electric and magnetic forces.
7-PS2-3: : Ask questions about data to determine the factors that affect the strength of electric and magnetic forces.
Charge Launcher
Launch a charged particle into a chamber. Charged particles can be added into the chamber to influence the path of the moving particle. The launch speed can be changed as well. Try to match a given path by manipulating the fixed particles in the chamber. 5 Minute Preview
Magnetic Induction
Measure the strength and direction of the magnetic field at different locations in a laboratory. Compare the strength of the induced magnetic field to Earth's magnetic field. The direction and magnitude of the inducting current can be adjusted. 5 Minute Preview
Pith Ball Lab
Pith balls with positive, negative, or no electrical charge are suspended from strings. The charge and mass of the pith balls can be adjusted, along with the length of the string, which will cause the pith balls to change position. Distances can be measured as variables are adjusted, and the forces (Coulomb and gravitational) acting on the balls can be displayed. 5 Minute Preview
7-PS2-5: : Conduct an investigation and evaluate the experimental design to provide evidence that fields exist between objects exerting forces on each other even though the objects are not in contact.
7-PS2-5: : Conduct an investigation and evaluate the experimental design to provide evidence that fields exist between objects exerting forces on each other even though the objects are not in contact.
Charge Launcher
Launch a charged particle into a chamber. Charged particles can be added into the chamber to influence the path of the moving particle. The launch speed can be changed as well. Try to match a given path by manipulating the fixed particles in the chamber. 5 Minute Preview
Coulomb Force (Static)
Drag two charged particles around and observe the Coulomb force between them as their positions change. The charge of each object can be adjusted, and the force is displayed both numerically and with vectors as the distance between the objects is altered. 5 Minute Preview
Magnetic Induction
Measure the strength and direction of the magnetic field at different locations in a laboratory. Compare the strength of the induced magnetic field to Earth's magnetic field. The direction and magnitude of the inducting current can be adjusted. 5 Minute Preview
Magnetism
Drag bar magnets and a variety of other objects onto a piece of paper. Click Play to release the objects to see if they are attracted together, repelled apart, or unaffected. You can also sprinkle iron filings over the magnets and other objects to view the magnetic field lines that are produced. 5 Minute Preview
Pith Ball Lab
Pith balls with positive, negative, or no electrical charge are suspended from strings. The charge and mass of the pith balls can be adjusted, along with the length of the string, which will cause the pith balls to change position. Distances can be measured as variables are adjusted, and the forces (Coulomb and gravitational) acting on the balls can be displayed. 5 Minute Preview
7-PS3-1: : Construct and interpret graphical displays of data to describe the relationships of kinetic energy to the mass of an object and to the speed of an object.
7-PS3-1: : Construct and interpret graphical displays of data to describe the relationships of kinetic energy to the mass of an object and to the speed of an object.
Air Track
Adjust the mass and velocity of two gliders on a frictionless air track. Measure the velocity, momentum, and kinetic energy of each glider as they approach each other and collide. Collisions can be elastic or inelastic. 5 Minute Preview
Energy of a Pendulum
Perform experiments with a pendulum to gain an understanding of energy conservation in simple harmonic motion. The mass, length, and gravitational acceleration of the pendulum can be adjusted, as well as the initial angle. The potential energy, kinetic energy, and total energy of the oscillating pendulum can be displayed on a table, bar chart or graph. 5 Minute Preview
Inclined Plane - Sliding Objects
Investigate the energy and motion of a block sliding down an inclined plane, with or without friction. The ramp angle can be varied and a variety of materials for the block and ramp can be used. Potential and kinetic energy are reported as the block slides down the ramp. Two experiments can be run simultaneously to compare results as factors are varied. 5 Minute Preview
Kinetic Energy: Ramp It Up!
In this standalone investigation, students take on the role of skatepark designers investigating how mass and speed influence kinetic energy. Using the Sled Wars Gizmo, they collect data and interpret graphs to uncover patterns showing how energy changes with different variables. Students use their findings to design a ramp that’s safe and fun, justifying choices with evidence and practicing skills in data analysis, modeling, and constructing explanations. The focus is on understanding the relationship between kinetic energy, mass, and speed, as well as energy transfer during motion. Preview
Kinetic and Potential Energy: Skate Park Engineers
In this three-part series, students become junior engineers tasked with designing a safe and exciting skate park. Using the Sled Wars Gizmo, they investigate how mass, speed, and ramp height affect kinetic and potential energy, as well as the transfer of energy during collisions. Students collect and analyze data, build and revise models, and apply their understanding to a real-world engineering challenge. Along the way, they deepen their grasp of core ideas like energy transfer, energy conservation, and the relationship between motion and energy. Preview
Roller Coaster Physics
Adjust the hills on a toy-car roller coaster and watch what happens as the car careens toward an egg (that can be broken) at the end of the track. The heights of three hills can be manipulated, along with the mass of the car and the friction of the track. A graph of various variables of motion can be viewed as the car travels, including position, speed, acceleration, potential energy, kinetic energy, and total energy. 5 Minute Preview
Sled Wars
Explore acceleration, speed, momentum, and energy by sending a sled down a hill into a group of snowmen. The starting height and mass of the sled can be changed, as well as the number of snowmen. In the Two sleds scenario, observe collisions between sleds of different masses and starting heights. 5 Minute Preview
Trebuchet
Design your own trebuchet to fling a projectile at a castle wall. All of the dimensions of the trebuchet can be adjusted, as well as the masses of the counterweight and payload. Select a target on the Launch tab, or just see how far your projectile will go. 5 Minute Preview
7-PS3-2: : Develop a model to describe that when the arrangement of objects interacting at a distance changes, different amounts of potential energy are stored in the system.
7-PS3-2: : Develop a model to describe that when the arrangement of objects interacting at a distance changes, different amounts of potential energy are stored in the system.
Energy Conversion in a System
A falling cylinder is attached to a rotating propeller that stirs and heats the water in a beaker. The mass and height of the cylinder, as well as the quantity and initial temperature of water can be adjusted. The temperature of the water is measured as energy is converted from one form to another. 5 Minute Preview
Energy of a Pendulum
Perform experiments with a pendulum to gain an understanding of energy conservation in simple harmonic motion. The mass, length, and gravitational acceleration of the pendulum can be adjusted, as well as the initial angle. The potential energy, kinetic energy, and total energy of the oscillating pendulum can be displayed on a table, bar chart or graph. 5 Minute Preview
Inclined Plane - Sliding Objects
Investigate the energy and motion of a block sliding down an inclined plane, with or without friction. The ramp angle can be varied and a variety of materials for the block and ramp can be used. Potential and kinetic energy are reported as the block slides down the ramp. Two experiments can be run simultaneously to compare results as factors are varied. 5 Minute Preview
Kinetic and Potential Energy: Skate Park Engineers
In this three-part series, students become junior engineers tasked with designing a safe and exciting skate park. Using the Sled Wars Gizmo, they investigate how mass, speed, and ramp height affect kinetic and potential energy, as well as the transfer of energy during collisions. Students collect and analyze data, build and revise models, and apply their understanding to a real-world engineering challenge. Along the way, they deepen their grasp of core ideas like energy transfer, energy conservation, and the relationship between motion and energy. Preview
Potential Energy on Shelves
Compare the potential energy of several objects when you place them on shelves of different heights. Learn that two objects at different heights can have the same potential energy, while two objects at the same height can have different potential energies. 5 Minute Preview
Potential Energy: Mystery of the Cracked Phone
In this standalone investigation, students play the part of investigators trying to solve why one phone cracked and another didn’t after being dropped. Using a new version of the familiar Things on Shelves Gizmo, developed specifically for this investigation, they explore how mass and height affect potential energy and how that energy transfers when objects fall. Students collect and analyze data, build and revise models, and connect their discoveries to real-world impacts. This investigation builds understanding of potential energy, gravitational energy, and energy transfer in collisions. Preview
Roller Coaster Physics
Adjust the hills on a toy-car roller coaster and watch what happens as the car careens toward an egg (that can be broken) at the end of the track. The heights of three hills can be manipulated, along with the mass of the car and the friction of the track. A graph of various variables of motion can be viewed as the car travels, including position, speed, acceleration, potential energy, kinetic energy, and total energy. 5 Minute Preview
Trebuchet
Design your own trebuchet to fling a projectile at a castle wall. All of the dimensions of the trebuchet can be adjusted, as well as the masses of the counterweight and payload. Select a target on the Launch tab, or just see how far your projectile will go. 5 Minute Preview
7-PS3-3: : Apply scientific principles to design, construct, and test a device that either minimizes or maximizes thermal energy transfer.
7-PS3-3: : Apply scientific principles to design, construct, and test a device that either minimizes or maximizes thermal energy transfer.
Feel the Heat
Have you ever used a glove warmer to keep your hands warm? How about an instant cold pack to treat an injury? In the Feel the Heat Gizmo, create your own hot and cold packs using various salts dissolved in water and different bag materials. Learn about exothermic and endothermic processes and how energy is absorbed or released when bonds are broken and new bonds form. 5 Minute Preview
Beat the Heat: Tackling Urban Heat Islands Using the Science of Energy - Middle School
Lake City's latest heat wave has more people in the hospital than ever before. Juan, a local student admitted to the hospital, lives in one of the hottest neighborhoods in the city. Students are hired as the city's Chief Heat Officer to investigate and solve the problem. As the Chief Heat Officer, students look at land uses, surface air temperatures, and building materials across Lake City. Students will develop a system model to test several design solutions and give the mayor a proposal to beat the heat. Video Preview
Protecting Permafrost: Heat Transfer Highway - Middle School
Thawing permafrost threatens the stability of critical infrastructure in the Arctic community of Frostville, Alaska. Students take on the role of a civil engineer to design heat transfer solutions to protect permafrost in a warming climate. Video Preview
7-PS3-4: : Plan an investigation to determine the relationships among the energy transferred, the type of matter, the mass, and the change in the average kinetic energy of the particles as measured by the temperature of the sample.
7-PS3-4: : Plan an investigation to determine the relationships among the energy transferred, the type of matter, the mass, and the change in the average kinetic energy of the particles as measured by the temperature of the sample.
Calorimetry Lab
Investigate how calorimetry can be used to find relative specific heat values when different substances are mixed with water. Modify initial mass and temperature values to see effects on the system. One or any combination of the substances can be mixed with water. A dynamic graph (temperature vs. time) shows temperatures of the individual substances after mixing. 5 Minute Preview
Energy Conversion in a System
A falling cylinder is attached to a rotating propeller that stirs and heats the water in a beaker. The mass and height of the cylinder, as well as the quantity and initial temperature of water can be adjusted. The temperature of the water is measured as energy is converted from one form to another. 5 Minute Preview
Heat Transfer by Conduction
An insulated beaker of hot water is connected to a beaker of cold water with a conducting bar, and over time the temperatures of the beakers equalize as heat is transferred through the bar. Four materials (aluminum, copper, steel, and glass) are available for the bar. 5 Minute Preview
Phase Changes
Explore the relationship between molecular motion, temperature, and phase changes. Compare the molecular structure of solids, liquids, and gases. Graph temperature changes as ice is melted and water is boiled. Find the effect of altitude on phase changes. The starting temperature, ice volume, altitude, and rate of heating or cooling can be adjusted. 5 Minute Preview
7-PS3-5: : Construct, use, and present arguments to support the claim that when the kinetic energy of an object changes, energy is transferred to or from the object.
7-PS3-5: : Construct, use, and present arguments to support the claim that when the kinetic energy of an object changes, energy is transferred to or from the object.
Air Track
Adjust the mass and velocity of two gliders on a frictionless air track. Measure the velocity, momentum, and kinetic energy of each glider as they approach each other and collide. Collisions can be elastic or inelastic. 5 Minute Preview
Energy Conversion in a System
A falling cylinder is attached to a rotating propeller that stirs and heats the water in a beaker. The mass and height of the cylinder, as well as the quantity and initial temperature of water can be adjusted. The temperature of the water is measured as energy is converted from one form to another. 5 Minute Preview
Sled Wars
Explore acceleration, speed, momentum, and energy by sending a sled down a hill into a group of snowmen. The starting height and mass of the sled can be changed, as well as the number of snowmen. In the Two sleds scenario, observe collisions between sleds of different masses and starting heights. 5 Minute Preview
7-PS4-1: : Use mathematical representations to describe a simple model for waves that includes how the amplitude of a wave is related to the energy in a wave.
7-PS4-1: : Use mathematical representations to describe a simple model for waves that includes how the amplitude of a wave is related to the energy in a wave.
Waves
Observe and measure transverse, longitudinal, and combined waves on a model of a spring moved by a hand. Adjust the amplitude and frequency of the hand, and the tension and density of the spring. The speed and power of the waves is reported, and the wavelength and amplitude can be measured. 5 Minute Preview
Sound Off, Please!: Designing Solutions to Reduce Noise Pollution - Middle School
As an acoustic engineer, students will work with an urban planner to learn how noise pollution impacts a community. Students will develop a system model to test design solutions. Wave properties of sound and how sound interacts with different surfaces will be explored and used as evidence to reduce noise pollution. Video Preview
7-PS4-2: : Develop and use a model to describe that waves are reflected, absorbed, or transmitted through various materials.
7-PS4-2: : Develop and use a model to describe that waves are reflected, absorbed, or transmitted through various materials.
Basic Prism
Shine white light or a single-color beam through a prism. Explore how a prism refracts light and investigate the factors that affect the amount of refraction. The index of refraction of the prism, width of the prism, prism angle, light angle, and light wavelength can be adjusted. 5 Minute Preview
Color Absorption
Mix the primary colors of light by using red, green, and blue lights. Use pieces of colored glass to filter the light and create a wide variety of colors. Determine how light is absorbed and transmitted by each color of glass. 5 Minute Preview
Earthquakes 1 - Recording Station
Using an earthquake recording station, learn how to determine the distance between the station and an earthquake based on the time difference between the arrival of the primary and secondary seismic waves. Use this data to find the epicenter in the Earthquakes 2 - Location of Epicenter Gizmo. 5 Minute Preview
Eyes and Vision 1 - Seeing Color
Observe how different colors of light are reflected or absorbed by colored objects. Determine that white light is a combination of different colors of light, and that one or more component colors may be reflected when white light is shone on an object. Understand that we see an object when light reflected from the object enters our eye. 5 Minute Preview
Heat Absorption
Shine a powerful flashlight on a variety of materials, and measure how quickly each material heats up. See how the light angle, light color, type of material, and material color affect heating. A glass cover can be added to simulate a greenhouse. 5 Minute Preview
Laser Reflection
Point a laser at a mirror and compare the angle of the incoming beam to the angle of reflection. A protractor can be used to measure the angles of incidence and reflection, and the angle of the mirror can be adjusted. A beam splitter can be used to split the beam. Both plane and irregular mirrors can be used. 5 Minute Preview
Longitudinal Waves
Observe the propagation of longitudinal (compression) waves in a closed or open tube with evenly-spaced dividers. The strength and frequency of the waves can be manipulated, or waves can be observed as individual pulses. Compare the movement of dividers to graphs of displacement, velocity, acceleration and pressure. 5 Minute Preview
Radiation
Use a powerful flashlight to pop a kernel of popcorn. A lens focuses light on the kernel. The temperature of the filament and the distance between the flashlight and lens can be changed. Several obstacles can be placed between the flashlight and the popcorn. 5 Minute Preview
Refraction
Determine the angle of refraction for a light beam moving from one medium to another. The angle of incidence and each index of refraction can be varied. Using the tools provided, the angle of refraction can be measured, and the wavelength and frequency of the waves in each substance can be compared as well. 5 Minute Preview
Ripple Tank
Study wave motion, diffraction, interference, and refraction in a simulated ripple tank. A wide variety of scenarios can be chosen, including barriers with one or two gaps, multiple wave sources, reflecting barriers, or submerged rocks. The wavelength and strength of waves can be adjusted, as well as the amount of damping in the tank. 5 Minute Preview
Waves
Observe and measure transverse, longitudinal, and combined waves on a model of a spring moved by a hand. Adjust the amplitude and frequency of the hand, and the tension and density of the spring. The speed and power of the waves is reported, and the wavelength and amplitude can be measured. 5 Minute Preview
Beat the Heat: Tackling Urban Heat Islands Using the Science of Energy - Middle School
Lake City's latest heat wave has more people in the hospital than ever before. Juan, a local student admitted to the hospital, lives in one of the hottest neighborhoods in the city. Students are hired as the city's Chief Heat Officer to investigate and solve the problem. As the Chief Heat Officer, students look at land uses, surface air temperatures, and building materials across Lake City. Students will develop a system model to test several design solutions and give the mayor a proposal to beat the heat. Video Preview
Shake it Off: Understanding Wave Properties to Develop Earthquake Alert Systems - Middle School
The Bay Area of California experiences frequent earthquakes. Earthquakes are unpredictable and cause enormous damage that leads to casualties. Students take on the role of an earth scientist to investigate the properties of seismic waves to develop an early warning system that warns citizens of an incoming earthquake and reduces casualties. Video Preview
Sound Off, Please!: Designing Solutions to Reduce Noise Pollution - Middle School
As an acoustic engineer, students will work with an urban planner to learn how noise pollution impacts a community. Students will develop a system model to test design solutions. Wave properties of sound and how sound interacts with different surfaces will be explored and used as evidence to reduce noise pollution. Video Preview
7-LS1-1: : Conduct an investigation to provide evidence that living things are made of cells; either one cell or many different numbers and types of cells.
7-LS1-1: : Conduct an investigation to provide evidence that living things are made of cells; either one cell or many different numbers and types of cells.
Cell Types
Explore a wide variety of cells, from bacteria to human neurons, using a compound light microscope. Select a sample to study, then focus on the sample using the coarse and fine focus controls of the microscope. Compare the structures found in different cells, then perform tests to see if the sample is alive. 5 Minute Preview
Embryo Development
Explore how a fertilized cell develops into an embryo, a fetus, and eventually an adult organism. Compare embryo development in different vertebrate species and try to guess which embryo belongs to each species. Use dyes to trace the differentiation of cells during early embryo development, from the zygote to the neurula. 5 Minute Preview
7-LS1-2: : Develop and use a model to describe the function of a cell as a whole and ways the parts of cells contribute to the function.
7-LS1-2: : Develop and use a model to describe the function of a cell as a whole and ways the parts of cells contribute to the function.
Cell Energy Cycle
Explore the processes of photosynthesis and respiration that occur within plant and animal cells. The cyclical nature of the two processes can be constructed visually, and the simplified photosynthesis and respiration formulae can be balanced. 5 Minute Preview
Cell Structure
Select a sample cell from an animal, plant, or bacterium and view the cell under a microscope. Select each organelle on the image to learn more about its structure and function. Closeup views and animations of certain organelles is provided. 5 Minute Preview
Cell Types
Explore a wide variety of cells, from bacteria to human neurons, using a compound light microscope. Select a sample to study, then focus on the sample using the coarse and fine focus controls of the microscope. Compare the structures found in different cells, then perform tests to see if the sample is alive. 5 Minute Preview
Osmosis
Adjust the concentration of a solute on either side of a membrane in a cell and observe the system as it adjusts to the conditions through osmosis. The initial concentration of the solute can be manipulated, along with the volume of the cell. 5 Minute Preview
Photosynthesis and Respiration: Chloe's Goldfish
Chloe's goldfish are sick, and she needs to help them quickly! In this standalone lesson, students use the Plants and Snails and Cell Energy Cycle Gizmos to investigate cellular respiration and determine how to help Chloe's fish. Preview
Photosynthesis and Respiration: Henry's Snails
Henry is having trouble with his pet snails. To help, students will investigate the interdependence of photosynthesis and respiration using the Plants and Snails and Cell Energy Cycle Gizmos. Students will be challenged to use plants to create a stable environment for Henry's snails. Preview
Photosynthesis and Respiration: Maximizing Oxygen Extension
To support a future moon station, NASA plans to grow plants to supply food and oxygen. Jorge's job is to investigate how to maximize oxygen production. Using the Photosynthesis Lab Gizmo, students will undergo a series of controlled experiments to determine the ideal light intensity, carbon dioxide concentration, temperature, and light wavelength. Preview
Photosynthesis and Respiration: Mission to Mars
Excited for his summer internship at NASA, Jorge dives into his assignment of finding a way to provide oxygen for astronauts on a mission to Mars. Using the Plants and Snails and Cell Energy Cycle Gizmos, students will investigate photosynthesis, cellular respiration, and how these two processes are related to find a solution to Jorge's challenge. Preview
Photosynthesis and Respiration: Winter Strawberries
Anna's grandparents are trying to grow winter strawberries in a greenhouse, but the plants aren't doing well. Students will use the Plants and Snails and Cell Energy Cycle Gizmo to investigate photosynthesis and find a way to help the strawberries grow. Preview
7-LS1-3: : Use argument supported by evidence for how the body is a system of interacting subsystems composed of groups of cells.
7-LS1-3: : Use argument supported by evidence for how the body is a system of interacting subsystems composed of groups of cells.
Cell Types
Explore a wide variety of cells, from bacteria to human neurons, using a compound light microscope. Select a sample to study, then focus on the sample using the coarse and fine focus controls of the microscope. Compare the structures found in different cells, then perform tests to see if the sample is alive. 5 Minute Preview
Circulatory System
Trace the path of blood through a beating heart and the network of blood vessels that supplies blood to the body. Take blood samples from different blood vessels to observe blood cells and measure the levels of oxygen, carbon dioxide, sugar, and urea. 5 Minute Preview
Digestive System
Digestion is a complex process, involving a wide variety of organs and chemicals that work together to break down food, absorb nutrients, and eliminate wastes. But have you ever wondered what would happen if some of those organs were eliminated, or if the sequence was changed? Can the digestive system be improved? Find out by designing your own digestive system with the Digestive System Gizmo. 5 Minute Preview
Frog Dissection
Use a scalpel, forceps, and pins to dissect realistic male and female frogs. Organs can be removed and placed into organ system diagrams. Once the dissections are complete, the frog organ systems can be compared. Zooming, rotating, and panning tools are available to examine the frog from any angle. 5 Minute Preview
Muscles and Bones
See how muscles, bones, and connective tissue work together to allow movement. Observe how muscle contraction arises from the interactions of thin and thick filaments in muscle cells. Using what you have learned, construct an arm that can lift a weight or throw a ball. Connective tissue, muscle composition, bone length, and tendon insertion point can all be manipulated to create an arm to lift the heaviest weight or throw a ball the fastest. 5 Minute Preview
Senses
Everything we know about the world comes through our senses: sight, hearing, touch, taste, and smell. In the Senses Gizmo, explore how stimuli are detected by specialized cells, transmitted through nerves, and processed in the brain. 5 Minute Preview
7-LS1-7: : Develop a model to describe how food is rearranged through chemical reactions forming new molecules that support growth and/or release energy as this matter moves through an organism.
7-LS1-7: : Develop a model to describe how food is rearranged through chemical reactions forming new molecules that support growth and/or release energy as this matter moves through an organism.
Cell Energy Cycle
Explore the processes of photosynthesis and respiration that occur within plant and animal cells. The cyclical nature of the two processes can be constructed visually, and the simplified photosynthesis and respiration formulae can be balanced. 5 Minute Preview
Dehydration Synthesis
Build a glucose molecule, atom-by-atom, to learn about chemical bonds and the structure of glucose. Explore the processes of dehydration synthesis and hydrolysis in carbohydrate molecules. 5 Minute Preview
Digestive System
Digestion is a complex process, involving a wide variety of organs and chemicals that work together to break down food, absorb nutrients, and eliminate wastes. But have you ever wondered what would happen if some of those organs were eliminated, or if the sequence was changed? Can the digestive system be improved? Find out by designing your own digestive system with the Digestive System Gizmo. 5 Minute Preview
Photosynthesis and Respiration: Chloe's Goldfish
Chloe's goldfish are sick, and she needs to help them quickly! In this standalone lesson, students use the Plants and Snails and Cell Energy Cycle Gizmos to investigate cellular respiration and determine how to help Chloe's fish. Preview
Photosynthesis and Respiration: Henry's Snails
Henry is having trouble with his pet snails. To help, students will investigate the interdependence of photosynthesis and respiration using the Plants and Snails and Cell Energy Cycle Gizmos. Students will be challenged to use plants to create a stable environment for Henry's snails. Preview
Photosynthesis and Respiration: Mission to Mars
Excited for his summer internship at NASA, Jorge dives into his assignment of finding a way to provide oxygen for astronauts on a mission to Mars. Using the Plants and Snails and Cell Energy Cycle Gizmos, students will investigate photosynthesis, cellular respiration, and how these two processes are related to find a solution to Jorge's challenge. Preview
7-LS1-8: : Gather and synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.
7-LS1-8: : Gather and synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.
Eyes and Vision 2 - Focusing Light
Once light enters the eye, it must be focused on the retina. Manipulate the pupil diameter to regulate the amount of light that enters then eye, then change the lens shape to focus light. Determine the changes in lens shape needed to maintain focus as the object distance changes. This is a followup to the Eyes and Vision 1 - Seeing Colors lesson. 5 Minute Preview
Eyes and Vision 3 - Sensing Light
Observe how photoreceptors on the retina are stimulated by different colors of light. Determine that cone cells are stimulated by specific colors of light and enable us to see color, while rod cells are stimulated by various colors and do not contribute to color vision. Experiment by varying the percentage of rod and cone cells in normal and dim light to see how rod cells help with night vision. 5 Minute Preview
Reaction Time 1 (Graphs and Statistics)
Test your reaction time by catching a falling ruler or clicking a target. Create a data set of experiment results, and calculate the range, mode, median, and mean of your data. Data can be displayed on a list, table, bar graph or dot plot. The Reaction Time 1 Student Exploration focuses on range, mode, and median. 5 Minute Preview
Senses
Everything we know about the world comes through our senses: sight, hearing, touch, taste, and smell. In the Senses Gizmo, explore how stimuli are detected by specialized cells, transmitted through nerves, and processed in the brain. 5 Minute Preview
Animal Group Behavior - Middle School
A farmer in Africa is having problems with elephants eating her corn and cotton crops. As a wildlife biologist, students learn about animal group behavior and relationships of elephants and humans with bees. Students collect data from the farm and elephants to hypothesize and test solutions that will protect the crops without hurting the elephants. Video Preview
Correlation last revised: 11/6/2025
About STEM Cases
Students assume the role of a scientist trying to solve a real world problem. They use scientific practices to collect and analyze data, and form and test a hypothesis as they solve the problems.
Each STEM Case uses realtime reporting to show live student results.
Introduction to the Heatmap
STEM Cases take between 30-90 minutes for students to complete, depending on the case.
Student progress is automatically saved so that STEM Cases can be completed over multiple sessions.
Multiple grade-appropriate versions, or levels, exist for each STEM Case.
Each STEM Case level has an associated Handbook. These are interactive guides that focus on the science concepts underlying the case.
How Free Gizmos Work
Start teaching with 20-40 Free Gizmos. See the full list.
Access lesson materials for Free Gizmos including teacher guides, lesson plans, and more.
All other Gizmos are limited to a 5 Minute Preview and can only be used for 5 minutes a day.
Free Gizmos change each semester. The new collection will be available January 1 and July 1.
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