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  • University of Colorado Boulder
Ratio and Proportion
Unrestricted Use
CC BY
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Play with the left and right hands in different ways, and explore ratio and proportion. Start on the Discover screen to find each challenge ratio by moving the hands. Then, on the Create screen, set your own challenge ratios. Once you've found a challenge ratio, try to move both hands while maintaining the challenge ratio through proportional reasoning.

Subject:
Mathematics
Material Type:
Activity/Lab
Lesson
Lesson Plan
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Date Added:
12/17/2021
Reactants, Products and Leftovers
Unrestricted Use
CC BY
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Create your own sandwich and then see how many sandwiches you can make with different amounts of ingredients. Do the same with chemical reactions. See how many products you can make with different amounts of reactants. Play a game to test your understanding of reactants, products and leftovers. Can you get a perfect score on each level?

Subject:
Chemistry
Physical Science
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
ChemEd DL
Chris Malley
Kathy Perkins
Kelly Lancaster
Patricia Loeblein
Robert Parson
Wendy Adams
Date Added:
03/01/2010
Reactions & Rates
Unrestricted Use
CC BY
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Explore what makes a reaction happen by colliding atoms and molecules. Design experiments with different reactions, concentrations, and temperatures. When are reactions reversible? What affects the rate of a reaction?

Subject:
Chemistry
Physical Science
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Kathy Perkins
Linda Koch
Mindy Gratny
Ron LeMaster
Trish Loeblein
Date Added:
11/15/2007
Reactions & Rates (AR)
Unrestricted Use
CC BY
Rating
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Explore what makes a reaction happen by colliding atoms and molecules. Design experiments with different reactions, concentrations, and temperatures. When are reactions reversible? What affects the rate of a reaction?

Subject:
Chemistry
Physical Science
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Kathy Perkins
Linda Koch
Mindy Gratny
Patricia Loblein
Ron LeMaster
Date Added:
12/02/2010
Resistance in a Wire
Unrestricted Use
CC BY
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Learn about the physics of resistance in a wire. Change its resistivity, length, and area to see how they affect the wire's resistance. The sizes of the symbols in the equation change along with the diagram of a wire.

Subject:
Physical Science
Physics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Michael Dubson
Mindy Gratny
Wendy Adams
Date Added:
11/16/2007
Resistance in a Wire (AR)
Unrestricted Use
CC BY
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Learn about the physics of resistance in a wire. Change its resistivity, length, and area to see how they affect the wire's resistance. The sizes of the symbols in the equation change along with the diagram of a wire.

Subject:
Physical Science
Physics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Michael Dubson
Mindy Gratny
Wendy Adams
Date Added:
06/02/2008
Resonance
Unrestricted Use
CC BY
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For advanced undergraduate students: Observe resonance in a collection of driven, damped harmonic oscillators. Vary the driving frequency and amplitude, the damping constant, and the mass and spring constant of each resonator. Notice the long-lived transients when damping is small, and observe the phase change for resonators above and below resonance.

Subject:
Physical Science
Physics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Jonathan Olson
Kathy Perkins
Michael Dubson
Mindy Gratny
Patricia Loeblein
Date Added:
07/20/2011
Reversible Reactions
Unrestricted Use
CC BY
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Watch a reaction proceed over time. How does total energy affect a reaction rate? Vary temperature, barrier height, and potential energies. Record concentrations and time in order to extract rate coefficients. Do temperature dependent studies to extract Arrhenius parameters. This simulation is best used with teacher guidance because it presents an analogy of chemical reactions.

Subject:
Chemistry
Physical Science
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Jack Barbera
Linda Koch
Ron LeMaster
Wendy Adams
Date Added:
09/01/2005
Reversible Reactions (AR)
Unrestricted Use
CC BY
Rating
0.0 stars

Watch a reaction proceed over time. How does total energy affect a reaction rate? Vary temperature, barrier height, and potential energies. Record concentrations and time in order to extract rate coefficients. Do temperature dependent studies to extract Arrhenius parameters. This simulation is best used with teacher guidance because it presents an analogy of chemical reactions.

Subject:
Chemistry
Physical Science
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Jack Barbera
Linda Koch
Ron LeMaster
Wendy Adams
Date Added:
09/02/2009
Rutherford Scattering
Unrestricted Use
CC BY
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How did Rutherford figure out the structure of the atom without being able to see it? Simulate the famous experiment in which he disproved the Plum Pudding model of the atom by observing alpha particles bouncing off atoms and determining that they must have a small core.

Subject:
Physical Science
Physics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Carl Wieman
Chris Malley
Kathy Perkins
Michael Dubson
Sam McKagan
Wendy Adams
Date Added:
03/01/2007
Rutherford Scattering (AR)
Unrestricted Use
CC BY
Rating
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How did Rutherford figure out the structure of the atom without being able to see it? Simulate the famous experiment in which he disproved the Plum Pudding model of the atom by observing alpha particles bouncing off atoms and determining that they must have a small core.

Subject:
Physical Science
Physics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Carl Wieman
Chris Malley
Kathy Perkins
Michael Dubson
Sam McKagan
Wendy Adams
Date Added:
03/02/2011
Salts & Solubility
Unrestricted Use
CC BY
Rating
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Add different salts to water, then watch them dissolve and achieve a dynamic equilibrium with solid precipitate. Compare the number of ions in solution for highly soluble NaCl to other slightly soluble salts. Relate the charges on ions to the number of ions in the formula of a salt. Calculate Ksp values.

Subject:
Chemistry
Physical Science
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Danielle Harlow
Kathy Perkins
Linda Koch
Ron LeMaster
Trish Loeblein
Wendy Adams
Date Added:
04/01/2006
Salts & Solubility (AR)
Unrestricted Use
CC BY
Rating
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Add different salts to water, then watch them dissolve and achieve a dynamic equilibrium with solid precipitate. Compare the number of ions in solution for highly soluble NaCl to other slightly soluble salts. Relate the charges on ions to the number of ions in the formula of a salt. Calculate Ksp values. Arabic Language.

Subject:
Chemistry
Physical Science
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Danielle Harlow
Kathy Perkins
Linda Koch
Patricia Loblein
Ron LeMaster
Wendy Adams
Date Added:
04/02/2010
Signal Circuit
Unrestricted Use
CC BY
Rating
0.0 stars

Why do the lights turn on in a room as soon as you flip a switch? Flip the switch and electrons slowly creep along a wire. The light turns on when the signal reaches it.

Subject:
Career and Technical Education
Electronic Technology
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Carl Wieman
Sam Reid
Wendy Adams
Date Added:
07/01/2005
Signal Circuit (AR)
Unrestricted Use
CC BY
Rating
0.0 stars

Why do the lights turn on in a room as soon as you flip a switch? Flip the switch and electrons slowly creep along a wire. The light turns on when the signal reaches it.

Subject:
Career and Technical Education
Electronic Technology
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Carl Wieman
Sam Reid
Wendy Adams
Date Added:
07/02/2009
Simplified MRI
Unrestricted Use
CC BY
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Is it a tumor? Magnetic Resonance Imaging (MRI) can tell. Your head is full of tiny radio transmitters (the nuclear spins of the hydrogen nuclei of your water molecules). In an MRI unit, these little radios can be made to broadcast their positions, giving a detailed picture of the inside of your head.

Subject:
Applied Science
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Carl Wieman
Danielle Harlow
Kathy Perkins
Michael Dubson
Ron LeMaster
Sam McKagan
Date Added:
11/16/2007
Simplifying Expressions - PhET Interactive Simulations
Unrestricted Use
CC BY
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Build coin expressions, then exchange them for variable expressions. Simplify and evaluate expressions until you are ready to test your understanding of equivalent expressions in the game!

Subject:
Algebra
Mathematics
Numbers and Operations
Material Type:
Interactive
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Amanda Mcgarry
Julie Carres
Lisa Nitzsche
Pam Branner
Pam Brenner
Traducci N De Diana L Pez
Date Added:
12/17/2021
Sound
Unrestricted Use
CC BY
Rating
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This simulation lets you see sound waves. Adjust the frequency or volume and you can see and hear how the wave changes. Move the listener around and hear what she hears.

Subject:
Physical Science
Physics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Carl Wieman
Danielle Harlow
Kathy Perkins
Ron LeMaster
Wendy Adams
Date Added:
10/22/2006