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# FREE Gizmos

## Get access to a rotating collection of free Gizmos chosen from our library of over 500 math and science labs and simulations. Sign up today to start teaching with these online STEM tools!

See How FREE Gizmos WorkModeling Fractions (Area Models)

FREE *with no time limit!*

Model and compare fractions using area models. Set the denominators with the arrow buttons, and then set the numerators with the arrow buttons or by clicking in the models. Compare...

Lesson Info Launch GizmoChocomatic (Multiplication, Arrays, and Area)

FREE *with no time limit!*

Use the Chocomatic to design candy bars made out of chocolate squares. Use multiplication to find the number of squares in each chocolate bar. Build collections of chocolate bars that all...

Lesson Info Launch GizmoAdding Whole Numbers and Decimals (Base-10 Blocks)

FREE *with no time limit!*

Use base-10 blocks to model two numbers. Then combine the blocks to model the sum. Blocks of equal value can be exchanged from one area of the mat to the other to help understand carrying...

Lesson Info Launch GizmoCity Tour (Coordinates)

FREE *with no time limit!*

Go sightseeing in fictional cities all over the world. Learn about coordinates on a graph by navigating around these cities on a grid-like city map. Some landmarks are shown on the map. For...

Lesson Info Launch GizmoHeredity and Traits

- Stem Case

*Video Preview*

As a bee scientist, students help a honey farm that has low honey production due to wasps. Students learn about bees, heredity and traits to determine which traits will help the bees defend...

Lesson InfoHoneybee Hive

- New!

FREE *with no time limit!*

Explore life in the hive by meeting workers, drones, and the queen bee herself! Visit flower patches to determine the best sources of food, and then perform a waggle dance to let the other...

Lesson Info Launch GizmoCircuit Builder

FREE *with no time limit!*

Create circuits using batteries, light bulbs, switches, fuses, and a variety of materials. Examine series and parallel circuits, conductors and insulators, and the effects of battery...

Lesson Info Launch GizmoPendulum Clock

FREE *with no time limit!*

Find the effect of length, mass, and angle on the period of a pendulum. The pendulum is attached to a clock that can be adjusted to tell time accurately. The clock can be located on Earth...

Lesson Info Launch GizmoOrder of Operations

FREE *with no time limit!*

Select and evaluate the operations in an expression following the correct order of operations.

Lesson Info Launch GizmoIndependent and Dependent Events

FREE *with no time limit!*

Compare the theoretical and experimental probabilities of drawing colored marbles from a bag. Record results of successive draws to find the experimental probability. Perform the drawings...

Lesson Info Launch GizmoMean, Median, and Mode

FREE *with no time limit!*

Build a data set and find the mean, median, and mode. Explore the mean, median, and mode illustrated as frogs on a seesaw, frogs on a scale, and as frogs stacked under a bar of variable...

Lesson Info Launch GizmoBeam to Moon (Ratios and Proportions)

FREE *with no time limit!*

Apply ratios and proportions to find the weight of a person on the moon (or on another planet). Weigh an object on Earth and on the moon and weigh the person on Earth. Then set up and solve...

Lesson Info Launch GizmoCollision Theory

FREE *with no time limit!*

Observe a chemical reaction with and without a catalyst. Determine the effects of concentration, temperature, surface area, and catalysts on reaction rates. Reactant and product...

Lesson Info Launch Gizmo3D Eclipse

FREE *with no time limit!*

Observe the motions of the Earth, Moon and Sun in three dimensions to investigate the causes and frequency of eclipses. Observe Earth's shadow crossing the Moon during a lunar eclipse, and...

Lesson Info Launch GizmoPhases of the Moon

FREE *with no time limit!*

Understand the phases of the Moon by observing the positions of the Moon, Earth and Sun. A view of the Moon from Earth is shown on the right as the Moon orbits Earth. Learn the names of...

Lesson Info Launch GizmoCell Energy Cycle

FREE *with no time limit!*

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...

Lesson Info Launch GizmoSled Wars

FREE *with no time limit!*

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...

Lesson Info Launch GizmoModeling and Solving Two-Step Equations

FREE *with no time limit!*

Solve a two-step equation using a cup-and-counter model. Use step-by-step feedback to diagnose and correct incorrect steps.

Lesson Info Launch GizmoDividing Exponential Expressions

FREE *with no time limit!*

Choose the correct steps to divide exponential expressions. Use the feedback to diagnose incorrect steps.

Lesson Info Launch GizmoRotations, Reflections, and Translations

FREE *with no time limit!*

Rotate, reflect, and translate a figure in the plane. Compare the translated figure to the original figure.

Lesson Info Launch GizmoConcurrent Lines, Medians, and Altitudes

FREE *with no time limit!*

Explore the relationships between perpendicular bisectors, the circumscribed circle, angle bisectors, the inscribed circle, altitudes, and medians using a triangle that can be resized and...

Lesson Info Launch GizmoIntroduction to Exponential Functions

FREE *with no time limit!*

Explore the graph of the exponential function. Vary the initial amount and base of the function. Investigate the changes to the graph.

Lesson Info Launch GizmoGraphs of Polynomial Functions

FREE *with no time limit!*

Study the graphs of polynomials up to the fourth degree. Vary the coefficients of the equation and investigate how the graph changes in response. Explore things like intercepts, end...

Lesson Info Launch GizmoCompound Interest

FREE *with no time limit!*

Explore compound interest in-depth, from compounded annually to compounded continuously. In addition, compare the END POINTS graph, with dots that fit an exponential curve, to the ALL TIME...

Lesson Info Launch GizmoGraphs of Derivative Functions

FREE *with no time limit!*

What does the graph of a derivative function look like? What can a derivative function tell you about the original function? What can't it tell you? Explore these questions for five...

Lesson Info Launch GizmoFast Plants^{®} 1 - Growth and Genetics

- New!

FREE *with no time limit!*

Grow Wisconsin Fast Plants® in a simulated lab environment. Explore the life cycles of these plants and how their growth is influenced by light, water, and crowding. Practice pollinating...

Lesson Info Launch GizmoFast Plants^{®} 2 - Mystery Parent

- New!

FREE *with no time limit!*

In this follow-up to Fast Plants® 1 - Growth and Genetics, continue to explore inheritance of traits in Wisconsin Fast Plants. Infer the genotype of a "mystery P2 parent" of a set of Fast...

Lesson Info Launch GizmoCrumple Zones

- New!

FREE *with no time limit!*

Design a car to protect a test dummy in a collision. Adjust the length and stiffness of the crumple zone and the rigidity of the safety cell to determine how the car will deform during the...

Lesson Info Launch GizmoSmelling in the Rain: Designing Solutions to Improve Air Quality

- Stem Case

*Video Preview*

A respiratory physiologist is concerned about the number of asthma attacks in children within her community. On certain days, the number is higher than the respiratory physiologist might...

Lesson InfoIsotopes

- New!

FREE *with no time limit!*

Explore what isotopes are by adding protons and neutrons to the nucleus of an atom. Plot both stable and radioactive isotopes on a graph of neutrons vs. protons, and explore how the...

Lesson Info Launch GizmoMeiosis

- New!

FREE *with no time limit!*

Explore how sex cells are produced by the process of meiosis. Compare meiosis in male and female germ cells, and use crossovers to increase the number of possible gamete genotypes. Using...

Lesson Info Launch GizmoDisease Spread

- Updated!

FREE *with no time limit!*

Observe the spread of disease through a group of people. The methods of transmission can be chosen and include person-to-person, airborne, and foodborne as well as any combination thereof....

Lesson Info Launch GizmoDigestive System

FREE *with no time limit!*

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...

Lesson Info Launch GizmoEclipse

FREE *with no time limit!*

Observe solar and lunar eclipses as the Moon orbits Earth. The full and partial shadows of the Moon and Earth can be displayed, and the Moon can also be dragged around Earth. See what the...

Lesson Info Launch Gizmo2D Eclipse

FREE *with no time limit!*

Manipulate the position of the Moon to model solar and lunar eclipses. View Earth's shadow, the Moon's shadow, or both. Observe the Moon and Sun from Earth during a partial and total...

Lesson Info Launch GizmoSorry, we could not find any Upcoming Free Gizmos to show you!

Sorry, we could not find any Upcoming Free Gizmos to show you!

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 Jan 01, 2024.

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.

Modeling Fractions (Area Models)

FREE *with no time limit!*

Model and compare fractions using area models. Set the denominators with the arrow buttons, and then set the numerators with the arrow buttons or by clicking in the models. Compare fractions visually, on a number line, or numerically using the least common denominator.

Lesson Info Launch GizmoChocomatic (Multiplication, Arrays, and Area)

FREE *with no time limit!*

Use the Chocomatic to design candy bars made out of chocolate squares. Use multiplication to find the number of squares in each chocolate bar. Build collections of chocolate bars that all have the same number of squares. Solve multiplication problems by joining two smaller chocolate bars into a large bar.

Lesson Info Launch GizmoAdding Whole Numbers and Decimals (Base-10 Blocks)

FREE *with no time limit!*

Use base-10 blocks to model two numbers. Then combine the blocks to model the sum. Blocks of equal value can be exchanged from one area of the mat to the other to help understand carrying when adding. Four sets of blocks are available to model different place values.

Lesson Info Launch GizmoCity Tour (Coordinates)

FREE *with no time limit!*

Go sightseeing in fictional cities all over the world. Learn about coordinates on a graph by navigating around these cities on a grid-like city map. Some landmarks are shown on the map. For others, you are only given the coordinates. Can you find all of them?

Lesson Info Launch GizmoHeredity and Traits

- Stem Case

*Video Preview*

As a bee scientist, students help a honey farm that has low honey production due to wasps. Students learn about bees, heredity and traits to determine which traits will help the bees defend their hives against the wasps. They then pick a new queen bee to pass on these traits to the bee colony.

Lesson InfoHoneybee Hive

- New!

FREE *with no time limit!*

Explore life in the hive by meeting workers, drones, and the queen bee herself! Visit flower patches to determine the best sources of food, and then perform a waggle dance to let the other bees know where to go. Can you help the bees find enough food to save the hive?

Lesson Info Launch GizmoCircuit Builder

FREE *with no time limit!*

Create circuits using batteries, light bulbs, switches, fuses, and a variety of materials. Examine series and parallel circuits, conductors and insulators, and the effects of battery voltage. Thousands of different circuits can be built with this Gizmo.

Lesson Info Launch GizmoPendulum Clock

FREE *with no time limit!*

Find the effect of length, mass, and angle on the period of a pendulum. The pendulum is attached to a clock that can be adjusted to tell time accurately. The clock can be located on Earth or Jupiter to determine the effect of gravity.

Lesson Info Launch GizmoOrder of Operations

FREE *with no time limit!*

Select and evaluate the operations in an expression following the correct order of operations.

Lesson Info Launch GizmoIndependent and Dependent Events

FREE *with no time limit!*

Compare the theoretical and experimental probabilities of drawing colored marbles from a bag. Record results of successive draws to find the experimental probability. Perform the drawings with replacement of the marbles to study independent events, or without replacement to explore dependent events.

Lesson Info Launch GizmoMean, Median, and Mode

FREE *with no time limit!*

Build a data set and find the mean, median, and mode. Explore the mean, median, and mode illustrated as frogs on a seesaw, frogs on a scale, and as frogs stacked under a bar of variable height.

Lesson Info Launch GizmoBeam to Moon (Ratios and Proportions)

FREE *with no time limit!*

Apply ratios and proportions to find the weight of a person on the moon (or on another planet). Weigh an object on Earth and on the moon and weigh the person on Earth. Then set up and solve the proportion of the Earth weights to the moon weights.

Lesson Info Launch GizmoCollision Theory

FREE *with no time limit!*

Observe a chemical reaction with and without a catalyst. Determine the effects of concentration, temperature, surface area, and catalysts on reaction rates. Reactant and product concentrations through time are recorded, and the speed of the simulation can be adjusted by the user.

Lesson Info Launch Gizmo3D Eclipse

FREE *with no time limit!*

Observe the motions of the Earth, Moon and Sun in three dimensions to investigate the causes and frequency of eclipses. Observe Earth's shadow crossing the Moon during a lunar eclipse, and the path of the Moon's shadow across Earth's surface during a solar eclipse. The angle of the Moon's orbit can be adjusted, as well as the distance of the Moon from the Earth.

Lesson Info Launch GizmoPhases of the Moon

FREE *with no time limit!*

Understand the phases of the Moon by observing the positions of the Moon, Earth and Sun. A view of the Moon from Earth is shown on the right as the Moon orbits Earth. Learn the names of Moon phases and in what order they occur. Click Play to watch the Moon go around, or click Pause and drag the Moon yourself.

Lesson Info Launch GizmoCell Energy Cycle

FREE *with no time limit!*

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.

Lesson Info Launch GizmoSled Wars

FREE *with no time limit!*

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.

Lesson Info Launch GizmoModeling and Solving Two-Step Equations

FREE *with no time limit!*

Solve a two-step equation using a cup-and-counter model. Use step-by-step feedback to diagnose and correct incorrect steps.

Lesson Info Launch GizmoDividing Exponential Expressions

FREE *with no time limit!*

Choose the correct steps to divide exponential expressions. Use the feedback to diagnose incorrect steps.

Lesson Info Launch GizmoRotations, Reflections, and Translations

FREE *with no time limit!*

Rotate, reflect, and translate a figure in the plane. Compare the translated figure to the original figure.

Lesson Info Launch GizmoConcurrent Lines, Medians, and Altitudes

FREE *with no time limit!*

Explore the relationships between perpendicular bisectors, the circumscribed circle, angle bisectors, the inscribed circle, altitudes, and medians using a triangle that can be resized and reshaped.

Lesson Info Launch GizmoIntroduction to Exponential Functions

FREE *with no time limit!*

Explore the graph of the exponential function. Vary the initial amount and base of the function. Investigate the changes to the graph.

Lesson Info Launch GizmoGraphs of Polynomial Functions

FREE *with no time limit!*

Study the graphs of polynomials up to the fourth degree. Vary the coefficients of the equation and investigate how the graph changes in response. Explore things like intercepts, end behavior, and even near-zero behavior.

Lesson Info Launch GizmoCompound Interest

FREE *with no time limit!*

Explore compound interest in-depth, from compounded annually to compounded continuously. In addition, compare the END POINTS graph, with dots that fit an exponential curve, to the ALL TIME graph, which has a more step-like appearance.

Lesson Info Launch GizmoGraphs of Derivative Functions

FREE *with no time limit!*

What does the graph of a derivative function look like? What can a derivative function tell you about the original function? What can't it tell you? Explore these questions for five different types of functions: linear, quadratic, cubic, absolute value, and sine.

Lesson Info Launch GizmoFast Plants^{®} 1 - Growth and Genetics

- New!

FREE *with no time limit!*

Grow Wisconsin Fast Plants^{®} in a simulated lab environment. Explore the life cycles of these plants and how their growth is influenced by light, water, and crowding. Practice pollinating the plants using bee sticks, then observe the traits of the offspring plants. Use Punnett squares to model the inheritance of genes for stem color and leaf color for these plants.

Fast Plants^{®} 2 - Mystery Parent

- New!

FREE *with no time limit!*

In this follow-up to Fast Plants^{®} 1 - Growth and Genetics, continue to explore inheritance of traits in Wisconsin Fast Plants. Infer the genotype of a "mystery P2 parent" of a set of Fast Plants based on the traits of the P1, F1, and F2 plants. Then create designer Fast Plants by selectively breeding plants with desired traits.

Crumple Zones

- New!

FREE *with no time limit!*

Design a car to protect a test dummy in a collision. Adjust the length and stiffness of the crumple zone and the rigidity of the safety cell to determine how the car will deform during the crash. Add seat belts and/or airbags to prevent the dummy from hitting the steering wheel. Three different body types (sedan, SUV, and subcompact) are available and a wide range of crash speeds can be used.

Lesson Info Launch GizmoSmelling in the Rain: Designing Solutions to Improve Air Quality

- Stem Case

*Video Preview*

A respiratory physiologist is concerned about the number of asthma attacks in children within her community. On certain days, the number is higher than the respiratory physiologist might expect. She thinks something in the environment is causing more rescue inhaler use on those days. As an air quality engineer, students will work collaboratively with a respiratory physiologist to learn how some air pollutants are released directly from sources while others are formed through chemical reactions. Students will develop a system model to test design solutions to recommend a plan to help decrease air pollution in a community with a record number of asthma cases in children.

Lesson InfoIsotopes

- New!

FREE *with no time limit!*

Explore what isotopes are by adding protons and neutrons to the nucleus of an atom. Plot both stable and radioactive isotopes on a graph of neutrons vs. protons, and explore how the neutron:proton ratio of stable isotopes changes from lighter to heavier elements.

Lesson Info Launch GizmoMeiosis

- New!

FREE *with no time limit!*

Explore how sex cells are produced by the process of meiosis. Compare meiosis in male and female germ cells, and use crossovers to increase the number of possible gamete genotypes. Using meiosis and crossovers, create "designer" fruit fly offspring with desired trait combinations.

Lesson Info Launch GizmoDisease Spread

- Updated!

FREE *with no time limit!*

Observe the spread of disease through a group of people. The methods of transmission can be chosen and include person-to-person, airborne, and foodborne as well as any combination thereof. The probability of each form of transmission and number of people in the group can also be adjusted.

Lesson Info Launch GizmoDigestive System

FREE *with no time limit!*

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.

Lesson Info Launch GizmoEclipse

FREE *with no time limit!*

Observe solar and lunar eclipses as the Moon orbits Earth. The full and partial shadows of the Moon and Earth can be displayed, and the Moon can also be dragged around Earth. See what the Moon and Sun look like from Earth during partial and total eclipses.

Lesson Info Launch Gizmo2D Eclipse

FREE *with no time limit!*

Manipulate the position of the Moon to model solar and lunar eclipses. View Earth's shadow, the Moon's shadow, or both. Observe the Moon and Sun from Earth during a partial and total eclipse. The sizes of the three bodies and the Earth-Moon distance can be adjusted.

Lesson Info Launch GizmoFind Your Solution

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