Force, friction, and air resistance

The amount of matter in an object.

The amount of force that pulls objects toward the Earth.

The force that pulls objects towards the Earth.

The unit used to measure forces

Two forces of the same size that act in opposite directions on an object.

The energy transferred when a force makes an object move.

A force that slows things down.

When you use oil to stop moving parts of machine from getting too hot.

The size that covers an object.

The force caused by air pushing against moving objects.