Question

How does a pulley enable a person to lift a load as heavy as a piano with little effort?

a) By decreasing the mechanical advantage.
b) By increasing the friction between the pulley and the rope.
c) By distributing the load's weight over multiple ropes.
d) By reducing the effort force needed.

Answer 1

A pulley enables a person to lift a load as heavy as a piano with little effort by reducing the effort force needed.

Step-by-step explanation:

A pulley enables a person to lift a load as heavy as a piano with little effort by reducing the effort force needed. When a pulley is used, the weight of the load is distributed over multiple ropes, which reduces the force required to lift the load. This allows the person to exert less effort force to lift the load, making it easier to lift heavy objects.