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[Grumblenuts]

A pulley is a simple machine that uses a rope or chain wrapped around a grooved wheel to change the direction of force, making it easier to lift heavy objects.

Correct.

 

[trevorjohnson83]

In a pulley system, the different sizes of pulley wheels can be seen as analogous to gears with different diameters. By using larger or smaller pulley wheels, the speed or force applied can be modified.

 

[Grumblenuts]

Correct.