Forces can change the shape of things.

Forces can change the ____ of moving things.

What is the name of the instrument?

Forces are measured in the unit _____

What is the size of the pulling force?

The force which opposes or goes against motion when two surfaces are in contact is called ______.

Two ways to reduce friction.

Friction can produce ____ that is not useful.

The friction between its surface and the air is called _______.