It is easier to roll a barrel than to pull it along the road. Why ?

It is easier to roll a barrel than pull it along the road. This statement is

It is easier to pull a body than to push, because -

STATEMENT-1: It is easier to pull a heavy object than to push it on a level ground and STATEMENT-2: The magnitude of frictional force depends on the nature of the two surfaces in contact.

It is easier to pull a lawn roller than to push it because pulling .

Explain why? (a) a horse cannot pull a cart and run in empty space. (b) passengers are thrown forward from their seats when a speeding bus tops suddenly (c) It is easier to pull a lawn mower than to push it. (d)a cricketer moves his hands backwards while holding a catch

It is easier to stop a tennis balll than a cricket ball moving with the same speed. Why?

It is easier to start a car engine on a warm day than on a chilly day. Why?