Driver's Ed chapter 9 studyguide

What rule is used to estimate your total stopping distance under ideal conditions?

4-second rule

Which statement best describes reaction time?

It averages 3/4 of a second.

In wet weather, with temperatures near the freezing point,

a bridge roadway freezes before a highway roadway.

A restraint that provides protection without having to be handled by the occupant is called

a passive restraint.

An example of an active restraint is

a safety belt.

When a vehicle's speed triples, how much more distance does it need to stop?

about nine times the distance

A vehicle going uphill works

against the force of gravity.

One purpose of the tread pattern on a tire is to

allow water to flow away from the tire.

Modern seat belts

are three-point lap and shoulder safety belts.

The center of gravity of a vehicle is that point

around which all weight is evenly balanced.

An air bag

automatically inflates to protect an occupant.

Air bags are designed to

be used with safety belts.

The best place to adjust speed to steer through a curve is

before entering the curve.

The distance a vehicle travels from the time the driver applies the brakes until the vehicle stops is

braking distance.

A small vehicle

can accelerate and stop more quickly than a large vehicle.

All states require that young children up to a certain age be protected by a

child safety seat.

A properly adjusted safety belt

fits snugly across the hips and comfortably across the chest.

Because of its energy of motion, when a vehicle's speed doubles, the vehicle needs about

four times the distance to stop.

What are the most important parts of the control system?

four tires

The force that keeps a tire from slipping on the roadway is called

friction.

A vehicle driven into a curve tends to

go in a straight line.

An important factor in maintaining traction is

good shock absorbers.

The force that pulls objects toward Earth is

gravity.

A rear-end collision involved a 20-year-old vehicle. The driver and front-seat passenger both sustained serious neck injuries. Which modern energy-absorbing device protects against such injuries?

head restraints

Good shock absorbers

help create traction.

Side door beams provide protection

in collisions when hit at an angle.

Child restraint seats must be used

in the back seat.

A vehicle's speed when going downhill tends to

increase.

Braking distance

increases as speed increases.

A banked curve

is higher on the outside than on the inside.

The higher the speed of your vehicle, the more

it will tend to go straight.

Energy of motion is another way of expressing

kinetic energy.

High energy of motion may cause a vehicle to

miss a tight curve.

If you drive through a curve at a speed higher than the posted speed, your vehicle

needs more traction to stay on the roadway.

If a tire is underinflated, the only part that grips the road well is the

outside edges of the tire tread.

If your tires wear out their center treads, they are

overinflated.

All-wheel drive means

power is supplied to four wheels.

The distance your vehicle travels while you respond to a road hazard is called

reaction distance.

A properly installed child safety seat is

required in all states for children up to a certain age.

Large vehicles, such as trucks and buses, have

slow stopping ability.

When a moving object hits something, what is the most important factor in determining how hard it hits?

speed

Three factors that determine force of impact are

speed, weight, and distance between impact and stopping.

When braking and turning, you use

split traction.

The second collision occurs when

the occupants hit the inside of the vehicle after a collision.

Which energy-absorbing feature protects the driver in a front-end collision?

the steering wheel and column

How many collisions occur when a vehicle hits a solid object?

three

Factors that affect traction include

tires, shock absorbers, and steering system.

When you slow for a turn, some traction is used to slow, and some is

used to turn.

The 4-second rule is an estimate of

your stopping distance.

Total stopping distance is the distance

your vehicle travels while you make a stop.