Question

Explain turning of the rear wheel and the foot pedal in terms of moments of force.

Answer 1

Because it [outermost gear] had has the largest radius, this gear provides the largest torque to the drive wheel. A large torque is required initially, because the bicycle starts from rest. As the bicycle rolls faster, the tangential speed of the chain increases, eventually becoming too fast for the cyclist to maintain by pushing the pedals. The chain is then moved to a gear with a smaller radius, so the chain has a smaller tangential speed that the cyclist can more easily maintain.

Answer 2

Answer:

in a bicycle, the foot pedal is at a large distance from the axle. To turn the wheel of the bicycle, a small force is applied on the foot pedal of the toothed wheel which is less than the force applied to the chain to move the bicycle.