Pulley is mainly used to lift objects above the ground. Thus this opposes:
Pulleys are used to lift ___ objects.
A block is kept at rest on ground. When a horizontal force is applied to the block, it doesn't move. The force which opposes this external force while the block is at rest is known as:
"Friction is a force which opposes the relative motion between two objects”.
Which device is use to lift up or more heavy object using less force ?