Question

What is the name of the fixed point about which a lever rotates?(1 point)
Responses

fulcrum
fulcrum

bar
bar

pulley
pulley

groove
groove

Answer 1

fulcrum

Answer 2

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

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

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 having a second person pulling on the rope

Answer 3

by reducing the friction on the pulleys