Question

A pulley system is operating at only 50% efficiency. How could the efficiency be increased? (1 point)
Responses

by reducing the friction on the pulleys
by reducing the friction on the pulleys

by decreasing the amount of weight being lifted
by decreasing the amount of weight being lifted

by having a second person pulling on the rope
by having a second person pulling on the rope

by adding more pulleys to the system
by adding more pulleys to the system

Answer 1

by reducing the friction on the pulleys

Reducing friction lowers energy lost to heat, so more of the input work becomes useful output work, increasing the system's efficiency.