PURPOSE: To illustrate mechanical advantage.
DESCRIPTION: The endless screw is a simple machine which illustraates mechanical advantage. Using only a small torque, a relatively heavy weight can be lifted. Concommitantly, a fast rotation of the worm produces a slow angular displacement of the wheel. The mechanical advantage is 136.
REFERENCES: (PIRA unavailable.)
EQUIPMENT: Endless screw, stand, and masses, as photographed.
SETUP TIME: 5 min.
Go back to Lecture-Demonstration Home Page.