Wheel and Axle

A wheel is a simple machine. For a wheel to do any good it has to rotate on an axle. A wheel and axle is actually a circular lever! Example of a Wheel and Axle: A doorknob is a wheel and axle.
The knob is a wheel and the metal rod that connects to the door is the axle. Without a knob it's pretty hard to turn the rod. It takes 100%effort (my opinion)
For more information go to Brainpop.com search wheel and axle and enter your username and password and votemaxcarter is signing out.

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