Question

In which places have you seen a pulley?

Answer 1

Hint : A pulley is a mechanical device used to lift objects. It is made in such a way that the applied force has direction opposite of the direction of motion. The pulleys can be used as a lift in a variety of places like in wells to lift water, etc.

Detailed step by step answer:
A pulley consists of a wheel around which a rope or chain is wound. One of the end of the rope is attached to a load which can be lifted by pulling the rope from the other side.

The main use of pulleys is to lift heavier loads. They can be three types of pulleys in use.
1.)One which has a fixed axle
2.)One which has a moving axle
3.)One which has a combination of both of these and is called compound pulley

A pulley is a machine which can be used at many places to make things easier.

1.)It is used in an elevator. The rope of the elevator may be wound over a pulley to ascend or descend the elevator.
2.)Pulleys are used in all types of wells for lifting water
3.)It may also be used in certain exercise equipment which involve movement
4.)It is frequently used in machinery and equipment in industries where heavy mechanical work is done.
5.)A bulldozer uses a pulley as its main part to perform tasks.

Note : A pulley is a simple machine which might be in use from Archimedes’ time. It is basically used to change the direction of force. Picking something vertically upwards requires more force than when lifted by changing direction as in the case of a pulley.