An explanation of and animation depicting the propagation of an electromagnetic wave through a material medium.
An introduction to astronomy written with a historical perspective.
Explore the physical world with this series that uses everyday experiments to demonstrate scientific ideas on this site.
A video showing why astronauts nearing Earth still appear weightless. Learn that there is actually gravity but the astronauts are falling and moving at such a rate that they appear to not be under the influence of gravity. [7:11]
Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.
Learn why objects fall to the ground with Newton's Law of Universal Gravitation as explained by this video. Video will explain history of discovery of the concept of gravity. It will also show how to solve for the force of gravity. [15:42]
Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.
This 10-minute video lesson looks at Newton's First Law (Galileo's Law of Inertia).
Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.
Looks at resistors that run alongside each other in a parallel series. [12:20]
Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.
Explore the Bohr model of atoms by studying the absorption and emission of light from simple gases in the context of starlight using this interactive simulation. A PDF worksheet and a video tutorial are also available. [2:52]
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Learn about making conversions between different types of units by negotiating with a trader at the crossroads. Practice exchanges with different measurement and currency systems in a simulation. Students apply unit conversion between metric and standard systems.
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Watch a clock slow down in the strong gravitational field near the event horizon of a massive black hole. A PDF worksheet and a video tutorial are also available. [2:57]
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Learn about centripetal motion in the context of a bobsled on a track. Adjust variables to test how many ways the bobsled can stay on the track in a race with the simulation. Examine potential problems that could occur with centripetal force.
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Understand how the transition from slipping to rolling occurs in the context of a thrown bowling ball using this interactive simulation. A PDF worksheet and a video tutorial are also available. [4:09]
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Learn about the relationship between velocity and position for a swimmer. Adjust the velocity of the legs, streamline, and arms to experiment with the slope of velocity in the simulation swimmer. Dig a bit deeper into the physics of swimming with additional examples.
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Learn about the law of reflection by curved mirrors and how the shape and size of a telescope impacts its observing capabilities.
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Learn about the relationship between position and velocity for a diver accelerating under the influence of gravity and air resistance. Measure velocity and position based on variables of the height of the cliff and air resistance. What did Galileo's free-fall mean? Find out from one of the four additional examples highlighting acceleration due to gravity.
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This sim explains the concept of elastic and inelastic collision using two bumper cars. A PDF worksheet and a video tutorial are also available. [3:40]
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Learn how the placement of charges leads to an electric field and electric potential patterns in nearby space using our interactive simulation. A PDF worksheet and a video tutorial are also available. [7:41]
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A simulation investigating why a diamond shines by looking at refraction, reflection, and total internal reflection.
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Learn about the analysis of parallel circuits in the context of a realistic household circuit using our interactive simulation. A PDF worksheet and a video tutorial are also available. [3:24]
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Understand how magnetic fields generated by solenoid coils can be used to create an operating doorbell using this interactive simulation. A PDF worksheet and a video tutorial are also available. [1:51]
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