Unit 3 chapter 9 Flashcards
The force that pulls objects toward the center of the earth is
Gravity
A vehicle’s speed when going down hill tends to
increase
Energy of motion is another way of expressing
kinetic energy
Because of it’s energy of motion, when a vehicle’s speed doubles, the vehicle needs about
four times the distance to stop
The gripping action that keeps a tire from slipping on the roadway is called
traction
When braking and turning, you use
changing traction forces
If a tire is underinflated, the only part that grips the road well is the
outside edges of the tire tread
All-wheel drive means
power is supplied to four wheels
Good shock absorbers
help create traction
In wet weather, with temperatures near the freezing point,
a bridge roadway freezes before a highway roadway
When a vehicle drives into a curve, your body tends to
go in a straight line
You drive through a curve at a speed higher than the posted speed. Your vehicle
needs more traction to stay on the roadway
A banked curve
is higher on the outside than on the inside
Large heavy vehicles, such as trucks and buses, have
slow stopping ability
Which statement best describes reaction time?
A. It shortens if the traffic situation is complex
B. It lengthens if the traffic situation is complex
C. It is not affected by driver impairment.
D. It averages 3/4 of a second
D
The distance a vehicle travels from the time the driver applies the brakes until the vehicle stops is
braking distance
If a vehicle increases its speed from 20 mph to 60 mph stopping distance will increase by
9 times
Three factors that determine force of impact are
speed, weight, and distance between impact and stopping.
Any reduction in speed during a collision will
reduce the damage inflicted
A restraint that provides protection without having to be handled by the occupant is called
a passive restraint
A properly adjusted safety belt
fits snugly across the hips and comfortably across the chest.
Air bags are designed to
be used with safety belts
An air bag
automatically inflates to protect an occupant
Which energy-absorbing feature protects the driver in a front or rear collision?
crush zones
A properly installed child safety seat is
required in all states for children up to a certain age
