Energy: Science Videos

This series explains energy, work, and gravity in physics. You will learn how energy is conserved, how springs store energy, and how simple machines like levers and pulleys give you mechanical advantage. You will also learn Newton's law of gravity and why astronauts feel weightless in orbit. These ideas explain how tools and machines make work easier. You should be comfortable with basic algebra.

Note: All Khan Academy content is available for free at www.khanacademy.org