Definition

1. Noun:
   • A simple machine consisting of a wheel with a groove in which a rope can run: A pulley is a device used to change the direction or point of application of a force applied to a rope or cable. It typically consists of a wheel on an axle, with a groove around its edge to guide the rope.

Usage

• A pulley is used to lift heavy loads with less effort by redirecting the force.
• It is a fundamental component in mechanical systems, from construction cranes to exercise equipment.

Examples

• Noun:
  • They used a pulley to hoist the sail up the mast.
  • The old well had a simple pulley system for drawing water.
  • The mechanic used a block and tackle, a type of pulley system, to lift the car engine.

Advanced Usage

• "Block and tackle": A system of two or more pulleys with a rope or cable threaded between them, used to lift heavy loads.

  • The sailors used a block and tackle to raise the heavy anchor.

• "Fixed pulley": A pulley that is attached to a structure and changes only the direction of the force.

  • A flagpole uses a fixed pulley to raise the flag.

• "Movable pulley": A pulley that moves with the load, providing a mechanical advantage by reducing the force needed.

  • A movable pulley was attached to the crate to make it easier to lift.

Variants and Related Words

• Sheave (n): The wheel of a pulley, often used in technical contexts.

  • The sheave was worn and needed replacement.

• Block (n): A housing containing one or more pulleys.

  • The block was secured to the ceiling beam.

Synonyms

• Sheave: (Specifically the wheel component)
• Block: (When referring to the housing unit)
• Tackle: (When referring to a system of ropes and pulleys)

Related Phrases

• Pulley system: An arrangement of one or more pulleys designed to provide a mechanical advantage.

  • The complex pulley system allowed a single person to lift the piano.

• Idler pulley: A pulley used to guide or tension a belt or chain without transmitting power.

  • The squeaking noise was coming from a loose idler pulley in the engine.

Noun

1. a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope