Dr. Ed. Chapter 5 quiz 1

The force that pulls objects toward the center of the earth is

• Gravity
• energy of motion
• kinetic energy
• inertia

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

• Twice the distance to stop
• half the distance to stop
• one-fourth the distance to stop
• Four times the distance to stop

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

• Center of the tire tread               
• only the outside edge of your tires
• tire cords
• wear bar

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

• 4-second rule
• 2-second following distance rule
• 12 second visual lead rule
• 3-second travel rule

A vehicle going uphill works 

• With the force of gravity
• against the force of gravity
• against centrifugal force
• With centrifugal force

If your tires wear out their center treads, they are

• Inflated properly
• underinflated
• overinflated
• over-sized

When a vehicles speed triples, how much more distance does it need to stop?

• About double the distance
• about 9 times the distance
• about 6 times the distance
• About three times the distance

What are the most important parts of the control system?

• Four tires
• brakes
• the steering wheel and column               
• the clutch and accelerator

The center of gravity of a vehicle is that point 

• Around which all weight is evenly balanced
• that is farthest from the ground
• Near the front bumper
• about 3 feet under the roadway surface

Energy of motion is another way of expressing

• Kinetic energy
• effect of wind on vehicle control
• mileage rating of a vehicle
• The way vehicle bodies are designed