Energy & Work

The force that pulls all objects toward the earth’s center is ____.

• friction

• gravity

• energy

What is done when a force moves an object over a distance?

• work

• energy

• friction

The ability to do work is ____.

• friction

• gravity

• energy

A simple machine makes ____ easier.

• gravity

• work

• time

The force applied to a simple machine to do work is called ____.

• load

• distance

• effort

A lever is a simple machine that is made of a bar that turns on a point. What is the point that the bar turns on called?

• fulcrum

• wheel

• cylinder

Give an example of an object that can be classified as a lever.

True or False. When the wheel of a wheel and axle turns one time, the wheel travels a shorter distance than the axle does.

• True

• False

True or False. The axle in a wheel and axle turns with greater force than the wheel does.

• True

• False

True or False. When using a pulley, the direction of the effort is down and the direction of the load is up.

• True

• False