Drivers Ed Lesson 3 Final Exam
Prediction Exam Questions Correctly
Answered.
Natural forces that act on your vehicle include the following: - CORRECT ANSWER Gravity.
Inertia.
Momentum.
Kinetic energy.
Potential energy.
Friction.
Centrifugal force.
Misjudging Natural Forces - CORRECT ANSWER By misjudging natural forces, you might lose control
while making a turn or lose traction on wet pavement and be unable to stop.
Gravity - CORRECT ANSWER Gravity is the force that pulls all objects toward the center of the earth.
Gravity affects your speed when you drive uphill and downhill. Traction relates to gravity in that it is the
result of friction between the road and your tires caused by the weight of the car (the pull of gravity).
Traction is a vital component of driving because you need traction to steer.
Driving Uphill - CORRECT ANSWER When you're driving uphill, the force of gravity is working against you
to slow you down, and you may need to accelerate or shift to a lower gear to maintain your speed.
Driving Downhill - CORRECT ANSWER When you drive downhill, the reverse is true. Gravity will cause
you to go faster and increase your stopping distance. You may need to shift to a lower gear or smoothly
apply your brakes to slow to a safe speed and control your vehicle.
Parking on an Incline - CORRECT ANSWER When you leave a vehicle parked on an incline, gravity pulls
your vehicle downhill. To keep your vehicle from rolling away, leave your vehicle in a low gear or in
"Park" if it has an automatic transmission. You should always engage your parking brake and may need
, to block your wheels by placing an object in front of or behind the tires. In case your parking brake fails,
always turn the front wheels of your vehicle so that the vehicle won't roll into the traffic lane.
Parking Downhill - CORRECT ANSWER If you're parking facing downhill, turn your front wheels toward
the curb or side of the road.
Parking Uphill - CORRECT ANSWER If you're parking facing uphill next to a curb, turn your front wheels
toward the middle of the road and allow the vehicle to roll back against the curb. If you're parking facing
uphill and there is no curb, turn your wheels toward the side of the road.
Inertia - CORRECT ANSWER Objects that are moving tend to continue moving, while objects that aren't
moving tend to remain at rest unless they're acted upon by some other force. This is called the law of
inertia and it applies to driving. For example, when you're waiting for a green light on flat pavement at
an intersection, your vehicle won't move unless you engage the engine or are otherwise pushed.
Effect of Inertia on Driving - CORRECT ANSWER While driving, inertia keeps your vehicle moving unless
the vehicle is acted upon by something, such as your brakes, the road surface, a fixed object (such as a
tree), or another vehicle. Inertia also causes your body and loose objects in the car to keep moving
forward if your vehicle comes to a sudden stop.
Inertia in Crashes - CORRECT ANSWER You may be injured because of the inertia and momentum of
loose objects in your car which can fly through the air during a sudden stop. When you're stopped and
hit from behind, your head tends to stay in place due to inertia while the rest of your body is pushed
forward by the seat. This causes whiplash. Properly adjusting your headrest can reduce injury due to
whiplash.
Potential Energy - CORRECT ANSWER Potential energy is the energy that an object possesses because of
its position or form. A book on a table has the "potential" energy to fall to the floor, whereas a book that
is already on the floor doesn't have this potential energy.
Effect of Potential Energy on Driving - CORRECT ANSWER When you're parked on a hill, gravity causes
your car to have potential energy. This energy can be converted to kinetic energy (motion) if the vehicle
breaks loose and rolls down the hill.
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