Question

how does a wheel helps in moving the axle ?(answer in simple words​

Answer 1

Answer:

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.

Hope it would help you...

Answer 2

Answer:

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.