Why is it more difficult to turn the steering wheel of a stationary motorcar than of a moving car ?

Why it is more difficult to rotate a stone by tieing it to a longer string than shorter string ?

It is easier to turn the steering wheel of a large diameter than that of a small diameter. Give reason.

Why is it difficult to measure the coefficient of expansion ofa liquid than solid?

Why is it more difficult to revolve a stone tied to a longer string than a stone tied to a shorter string ?

Why is it difficult to move a bike with its brakes on ?

Why it is more difficult to revolve a stone by tying it to a longer string than by tying it to a shorter string ?