Wheel and Axle

The wheel and axle consists of a round disc, called a wheel, and a smaller disc or rounded rod, called an axle, joined at the center so that they rotate together.

The wheel and axle can be viewed as a type of lever. It rotates around the center, so the center acts as the fulcrum. If you turn the wheel, you can turn the axle with less force.

Door knobs, screwdrivers, faucets, and steering wheels are examples of the wheel and axle.

<The principle of the wheel and axle>

The force applied to the wheel times the radius of the wheel equals the force applied to the axle times the radius of the axle.






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