This is an English translation of the 1905 paper by Albert Einstein on Special Relativity. Updates have been made to the notation. The article appeared in the book The Principle of Relativity. The article showed that the...

Authored by Eleanor Kopsian of Franklin Frazier, this is an activity intended to help students understand orbital motion and Kepler's Laws through a comparison of a circle and an ellipse and the application of Kepler's...

Simply in design, this lesson plan was created by Deborah Lojkutz of Joliet West High School, the objective of this activity is to teach students the concept of periodic motion and relate it to the movement of a...

This webpage contains an applet that simulates the control of a Lunar Lander. The user is must touch down gently on the lunar surface. Key commands control the thrust and the orientation of the Lander. Extra points for...

This simulation provides a realistic virtual mass-and-spring laboratory. Users can explore spring motion by manipulating stiffness of the spring and mass of the hanging weight. Concepts of Hooke's Law and elastic...