How Is a Doorknob a Wheel and Axle?

Answer

The doorknob is a wheel and axle. The knobs are the wheels on either side of the door. The axle is what connects the two of them when you turn the doorknob.
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The wheel and axle is a machine that is actually a type of lever. A common example of this machine is the steering wheel of a car or a doorknob. Turning the axle ...
A doorknob is a type of simple machine. It is a form of a wheel and axle, with the knob being the wheel. Other types of simple machines include levers, wedges, ...
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