Quiz 8 - Physics of Driving and Occupant Restraint

A vehicle's momentum depends on its

• speed and weight.

• friction.

• kinetic energy.

• center of gravity.

If only the outer edges of a tire grip the road, the tire is

• properly inflated.

• overinflated.

• flat.

• under inflated.

Three factors that affect braking distance are

• car and roadway conditions and speed.

• tread depth, controlled recovery, and the motion of energy.

• steering ability, centrifugal force, and ocular tracing.

• engine power, tire pressure, and wind resistance.

If you are trying to get out of a skid, you should

• look for wet leaves to slow you down.

• accelerate quickly.

• slam on the brakes.

• keep your foot off the pedals and steer in the direction that you want the vehicle to go.

If your vehicle has good directional control,

• you can drive without using brakes.

• you can make sharp turns at high speed.

• you will be able to keep the vehicle moving in the direction in which you steer it.

• you can decrease total stopping distance by 3 seconds.

After driving through a deep puddle, you should

• stop at the nearest service station for brake fluid.

• apply light pressure to the brake pedal.

• only use engine braking for a while.

• turn off the engine.

A power skid occurs when you

• apply the brakes too hard.

• press the accelerator too hard.

• downshift too quickly.

• turn the steering wheel sharply.

A driver can turn successfully as long as there is enough

• adhesion to overcome friction.

• centrifugal force to overcome friction.

• speed to maintain balance.

• friction to overcome centrifugal force.

Because of inertia,

• objects at rest move in a straight line.

• moving objects continue to move along a curved path.

• moving objects continue to move in a straight line.

• objects at rest remain at rest.

A vehicle's speed and weight both affect

• tire wear.

• force of impact.

• the center of gravity.

• friction.