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

It is easier to roll 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

Why it is easier to roll a barrel than to push it along the road ?

It is easier to roll than to pull a barrel along a road. Explain.

It is easier to pull a lawn mower than to push it.

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

(A) : It is easier to pull a lawn roller than to push on the same horizontal rough surface (R ) : Pulling body decreases normal reaction