CK-12 Foundation
Ck 12: Physical Science: Compound Machine
[Free Registration/Login may be required to access all resource tools.] Provides a definition of a compound machine with examples and discusses the efficiency and mechanical advantage of compound machines.
Science Struck
Science Struck: Examples of Pulleys in Daily Life
Learn how pulleys work and their many uses in everyday life, industry, recreation, and other activities. Includes many pictures of pulleys and pulley systems.
Alabama Learning Exchange
Alex: How to Make Something Simple, Hard
Students will have completed a unit of forces and motion prior to the current unit of study on simple machines (lever, inclined plane, screw, wedge, pulley, wheel and axle). Students will review the functions and examples of simple...
Science Struck
Science Struck: How Does an Ancient and Modern Catapult Work
A short explanation of how a catapult works and some examples of them.