pulley

A pulley is a simple machine that uses a wheel and a rope to change the direction of a force. Pulleys are often used to lift heavy objects.

Here is how a pulley works:

• You attach a rope to the object you want to lift.
• You pass the rope over the pulley wheel.
• You pull on the other end of the rope.
• The pulley wheel turns, and the rope moves up.
• The object you are lifting moves up with the rope.

Pulleys work by changing the direction of the force you apply. When you pull down on the rope, the pulley wheel turns, and the rope moves up. This means that you can lift the object with less force than you would if you were just lifting it directly.

Here are some examples of pulleys:

• A block and tackle: This is a type of pulley system that uses two or more pulleys to lift a heavy object.
• A clothesline pulley: This is a type of pulley that is used to raise and lower a clothesline.
• A window pulley: This is a type of pulley that is used to open and close windows.

The pulley is used to lift heavy objects.