Front

Gravity

Back

The force that pulls vehicles toward the earth.

Front

Friction

Back

The gripping action that keeps tires from slipping.

Front

Passive restraint device

Back

A restraint device, such as an air bag, that works automatically and the occupant does not need to fasten.

Front

Traction

Back

The friction which allows tires to grip the roadway.

Front

Tread

Back

The grooved surface of a tire that grips the roadway.

Front

Active restraint device

Back

A safety belt that a vehicle’s occupant must adjust.

Front

Banked curve

Back

A curve that is higher on the outside.

Front

Force of impact

Back

The force with which one moving object hits another object.

Front

Blowout

Back

A sudden loss of air pressure in a tire, often caused by a bald tire.

Front

Energy of motion

Back

When an object moves, it uses kinetic energy.