Question

Efficiency of Machines Quick Check
5 of 55 of 5 Items
Question
A pulley system is operating at only 50% efficiency. How could the efficiency be increased? (1 point)
Responses

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

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

Answer 1

The efficiency of a pulley system can be increased **by reducing the friction on the pulleys**. Reducing friction allows more of the input energy to be transferred into useful work, thereby improving efficiency.