Question

how is a wheel and axle useful​

Answer 1

Answer:

wheel and axle used to reduce friction of moving vehicle with the ground

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Answer 2

Wheel and axle is useful because it provides linear motion by the rotation of wheel and so it reduces the friction because rolling friction is less than sliding friction. Wheel and axle sometimes is also used to lift heavy things.

Examples-steering wheel of a car, screw diver, water tap, door knob, bicycle pedal etc..

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• Meaning of linear motion-moving in a straight direction/line