What can be done to improve the efficiency of a ramp? (1 point)
• Make it shorter and steeper.
• Add a rough surface.
• Smooth the surface.
• Insulate the surface with foam.
3 answers
Smooth the surface.
What is the name of the fixed point about which a lever rotates?
(1 point)
• bar
• fulcrum
• groove
• pulley
(1 point)
• bar
• fulcrum
• groove
• pulley
Fulcrum
1 answer