A mover wants to use his own weight to lift a 450-pound box with a lever and a fulcrum. He weighs 150 pounds.?

Question

If the output arm is 1 meter long, how long does the input arm need to be?

1)
0.3 meters
2)
3 meters
3)
4 meters
4)
6 meters

Answer 1

THe answer is "1) 0.3 meters."

That is because the output arm needs to be three times as long as the input arm because the weight to be lifted is three times the mover's weight.

Answer 2

450 pounds x 1 meter = 150 pounds x 3 meters

So you need a 3 meter long input arm

Answer 3

450/150 = 3m