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