Pulley

part · 800 BC · Ancient world

A grooved wheel for a rope; changes the direction of force.

What it is made of

• Wheel — has part. A pulley is a wheel with a groove for a rope.

Principles and materials it uses

• Wood — is made of. Pulleys were turned from wood.
• Rope — uses. A rope runs over the pulley.

Where it is used

• Block and tackle — is part of. A block and tackle is several pulleys and a rope.
• Elevator — is part of. The rope runs over a pulley.
• Belt drive — is part of. The belt wraps around pulleys.
• Cable car — is part of. Pulleys.
• Tide-predicting machine — is part of. Pulleys add up the harmonics.

What it is a kind of

• Simple machine — is a kind of. A pulley is a simple machine.

Take Pulley apart

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