how does a wheel helps in moving the axle ?(answer in simple words
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The wheel and axle is a machine consisting of a wheel attached to a smaller axle so that these two parts rotate together in which a force is transferred from one to the other. ... It can amplify force; a small force applied to the periphery of the large wheel can move a larger load attached to the axle.
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when a perfect shape is there for gravitational force, the kinetic energy will be more gravity will try to consume, so friction will release more, that's why wheels are circle.
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