Question

Why is the mechanical advantage of using a single pulley always 1? Assume there’s no friction.

Answer 1

Explanation:

Say you are pulling on a rope that goes over one frictionless pulley. You are essentially moving the mass but in a different direction than gravity, so there is no advantage or disadvantage.

Answer 2

Explanation:

because number of pulley used there is 1 and MA of pulley is equal to number of pulley