A force causes an object to 

The force that pulls any two objects towards each other is 

The force that slows down moving objects is

When a person starts to move potential energy changes to 

Which of the following uses chemical energy?

You are doing work when you

A nail is an example of a

A compound machine is something that contains 

Friction occurs when two objects rub against each other

Gravity pushes two objects away from each other

Weight  is usually a measure of the force of gravity.

Inertia is a force that  makes objects speed up.

A ball is thrown straight up falls to Earth because of inertia.

Forces cannot make an object start moving.

The heavier the object, the greater the force needed to move it.

Every time you do work, you are using energy. 

Kinetic energy is energy that an object has because of its position.

A wind up toy uses mechanical energy.

When you are on a slide, you have the greatest kinetic energy when you are at the top.

Which simple machine uses a wheel?