[Free Registration/Login Required] A simulation exploring how contact lens correct your vision!.

[Free Registration/Login Required] Learn about centripetal motion in the context of the game of tether-ball.

[Free Registration/Login Required] Learn about the centripetal motion in the context of a roller coaster going through a loop-the-loop and over a hill.

[Free Registration/Login Required] Practice with the concepts of conservation of momentum and energy by analyzing a special case of the ballistic pendulum.

[Free Registration/Login Required] Why do ducks make a 'V' shape in the water when they swim? Explore the doppler effect using this interactive simulation.

[Free Registration/Login Required] Understand the Law of Reflection by plane mirrors and the formation of virtual images. Use the simulation to play with variables for a variety of reflections. Further examples explaining how mirrors...

[Free Registration/Login Required] 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...

[Free Registration/Login Required] Learn about wave harmonics on a string by looking closely at the sound produced by a violin. Test string tension with harmonic number on violin strings in a simulated practice. Understand sound waves...

[Free Registration/Login Required] 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....

[Free Registration/Login Required] Learn about adding force vectors in two dimensions using the example of a painting hanging from two strings. Experiment with variables of weight and angles to hang a portrait in this physics simulation....

[Free Registration/Login Required] Learn about adding two vectors together by components in the context of a GPS-style city map. Adjust magnitude and angles in the two vectors to simulate the driverless car. Examples taking this concept...

[Free Registration/Login Required] 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...

[Free Registration/Login Required] Learn about the relationship between position, velocity, and acceleration for two objects in one-dimensional motion. Experiment with varying approaches to the race for both Irwin and Ruthie to see how...

[Free Registration/Login Required] 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...

[Free Registration/Login Required] Uncover the relationship between pressure, force, and contact area in the context of a fire truck. Play with vehicle mass, number of tires, and guage pressure with this simulation to see what...

[Free Registration/Login may be required to access all resource tools.] A complete, web-based, multi-media textbook covering a wide variety of Chemistry concepts.

[Free Registration/Login may be required to access all resource tools.] Videos, texts, activities, and assessments about the factors that characterize living things.

[Free Registration/Login may be required to access all resource tools.] Watch videos, read grade-level texts, complete activities, and take assessments about prokaryotic and eukaryotic cells.

[Free Registration/Login may be required to access all resource tools.] Students learn about scientific explanations and interpretations through instructional videos, grade-level texts, interactive activities, and quick assessments.

[Free Registration/Login may be required to access all resource tools.] Instructional videos, grade-level texts, interactive activities, and review material about the scientific method.

[Free Registration/Login may be required to access all resource tools.] Videos, texts, activities, and assessments about food chains and food webs in an ecosystem.

[Free Registration/Login Required] Learn about the relationship between position and velocity for a model rocket during launch and in free-fall. Experiment with rocket mass, rocket thrust, and rocket burn time to understand the...

[Free Registration/Login may be required to access all resource tools.] Students learn about atoms and atomic structure in this collection of instructional videos, grade-level texts, and quick assessments.

[Free Registration/Login may be required to access all resource tools.] Read grade-level texts, complete activities, and take assessments about cell biology.