Simple Machines: Lever

Duration:

Year Published: 1954

Complete Record: Presents the lever as a simple machine which can change the amount of force and/or its direction. Presents the interrelationship of force and distance; and shows such familiar forms f the lever as a seesaw, nutcracker, and broom. Also shows examples of more complex machines which utilize the principle of the lever. (Simple Machines Cort Series).