What would happen to a slowly moving frozen sock on a frictionless planet?

Moving on to the unit on the Physics of Electricity, it's time to talk about charge. What is charge? Are there positive and negative charges? What do those things mean? In this video episode, Shini talks about electrostatic forces,...

Understand how force, acceleration, gravity, friction, and wind resistance all relate to the exciting sport of alpine skiing. [4:00]

This video covers the basics of gravity and the Law of Universal Gravitation. [15:42]

Mr. Andersen shows you how to draw free body diagrams of various objects. The major forces (like gravity, normal, tension, friction, air resistance, etc.) are discussed and then applied to various problems.