Question

Which is a result of using a machine?

a.The mechanical advantage makes the work output greater than the work input.
b.The machine can put out force without having any force applied to it.
c.A large force can be exerted through a long distance to have a small force exerted through a short distance.
d.A large force can be exerted through a short distance to have a small force exerted through a long distance.

Answer 1

The correct answer is:

D. A large force can be exerted through a short distance to have a small force exerted through a long distance.

Answer 2

D.
The energy into the system is the same as that out of the system. Its just that a small force is applied over a larger distance at one end while a large force is applied over a smaller distance at the other end. Keep in mind:
Work = Force x displacement
The work remains constant.