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A simple pulley is a rope (or chain or belt) with one wheel this may be a class 1 or class 2 pulley.

  1. For a class 1 pulley, the pulley is stationary and the force applied to the rope is in the opposite direction as the movement of the object.
  2. For a class 2 pulley, the pulley is attached to the moving object and the force applied to the rope is in the same direction as the motion of the object.

A compound pulley, consisting of an arrangement of more than one simple pulley, provides many other possibilities with the direction of force either the same direction or the opposite direction of the motion of the object being moved.

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Q: What kind of pulley changes the direction of the input force but does not change the amount of force you apply?
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