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84 Cards in this Set
- Front
- Back
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Center of gravity
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point around which an object's weight is evenly distributed
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Energy of motion
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the energy an object has because it is moving
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gravity
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force that pulls all things to earth
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banked curve
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A curve that is higher on the outside than it is on the inside
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blowout
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a sudden loss of air pressure in a tire
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friction
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force that keeps each tire from sliding on the road
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tread
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outer grooved surface of a tire that grips the road
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breaking distance
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the distance your car travels after you apply the breaks
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perception distance
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distance your vehicle travels during perception time
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perception time
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the length of time it takes you to identify, predict, and decide to slow for a hazard
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reaction distance
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distance your vehicle travels while you react
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reaction time
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length of time you take to execute your action
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total stopping distance
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distance your vehicle travels while you make a stop
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active restraint device
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restraint device that you have to engage
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force of impact
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the force with which a moving object hits another object.
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passive restraint device
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an automatic restraint device--such as an air bag.
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restraint device
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Any part of a vehicle that holds an occupant in a collision
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Two Points of Energy of Motion
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1). A fast car has more energy of motion than a slow car.
2) A heavy car has more energy of motion than a light car. |
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The more energy of motion, the harder it is to...
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Stop
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When should you leave more distance between your car and the car ahead of you?
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1). The faster you are driving
2). The heavier your car/load is |
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Which Car has more energy of motion:
Car A going 35 miles per hour Car B going 50 miles per hour |
Car B
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Which Car has more energy of motion:
Car A going 75 miles per hour Car B going 50 miles per hour |
Car A
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What is Friction?
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The force that keeps the tires of your vehicle from sliding on the road.
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What is traction?
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The ability of the tire to grip the road because of friction.
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What is a groove?
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A long, narrow cut in the tire that increases traction.
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What roadway conditions can reduce traction?
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wet, muddy, sandy, gravel, oily, ice
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What is hydroplanning?
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the vehicle is out of control and floating along the surface of a wet road
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What is tread?
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The outer grooved surface of a tire that grips the road.
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What is a bald tire?
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A smooth tire without tread.
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Why are bald tires dangerous?
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They cannot grip a wet road.
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What is a blowout?
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A sudden loss of tire air pressure while driving. After a blowout your tire is flat.
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What is a puncture?
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A hole in the tire.
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What is underinflation?
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When there is not enough air in your vehicle's tires.
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What is overinflation?
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When there is too much air in the vehicle's tire.
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What is temperature?
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A measure of how hot or cold it is, measured in Fahrenheit and Celsius.
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What car conditions reduce traction?
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bald tires and worn shock absorbers
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What weather conditions reduce traction?
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rain and snow
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What is a curve?
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A road that does not run in a straight line.
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What is a banked curve?
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A curve that is higher on the outside than it is on the inside
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What does perceive mean?
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To use your sense to become aware of something
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What is total stopping distance?
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How far your vehicle travels while you make a stop. It begins with you first seeing something and realizing that you need to stop.
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What is perception time?
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The length of time it takes you to see a hazard and predict and decide that you need to stop.
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What is perception distance?
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How far your vehicle travels during perception time.
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What is reaction time?
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The length of time your vehicle travels while you react.
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What is reaction distance?
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How far your vehicle travels while you react.
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What is braking distance?
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How far your vehicle travels from the time you apply the brake until your vehicle stops.
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What is impact?
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When two things hit each other; a collision.
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What is force of impact?
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The strength with which one moving object hits another object.
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What affects the force of impact?
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Speed, weight, and distance between the impact and stop.
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What is the proportion of force of impact?
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The square of the increase of a vehicles speed. A car going two times faster hits something four times harder.
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What is a restraint device?
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Any part of a vehicle that holds an occupant in a collision.
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What is a passive restraint device?
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A restraint device that works automatically, such as an air bag.
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What is an active restraint device?
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A restraint device that you have to do something to make it work. Buckling up or adjusting a safety belt.
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Air Bag
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A balloon-type of passive restraint device that automatically inflates or fills with air to protect you
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What is inertia?
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Inertia is the law of motion. An object at rest wants to stay or remain at rest.
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What is the basis for many of the ideas used to keep people safe (i.e. airbags, crumple zones, crash cushions, breakaway utility poles)?
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They all work to delay the impact, or to extend the time of impact so that the people inside of the vehicles don't experience such severe, sudden & violent trauma and damage to their bodies and brains.
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What happens in a collision with cars of UNEQUAL mass (or size/weight), like an SUV & a smaller car)?
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The larger car would push the smaller car backwards during the crash, causing a greater speed change in the lighter car than the heavier car. The people inside of the smaller car would experience more force and probably receive worse injuries . Smaller cars give less protection to its occupants than larger, heavier cars.
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Why is it important for the vehicle's structure to perform well in a crash? |
Because the vehicle's structure can make a huge effect on the lives and bodies of the occupants. It can have a good effect if the car is well maintained and has great safety features, and if the occupants are wearing seat belts.
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Force that pulls objects to the earth...
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gravity
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Going downhill in a vehicle tends to...
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increase its speed
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Energy of motion...
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kinetic energy
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If a vehicle's energy of motion, doubles its speed, if will take a vehicle how long to stop...
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four times the distances
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Gripping action of the tires...
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friction
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Turning and braking causes..
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split traction
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Underinflated tires grips the road with..
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outside of the tire tread
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All wheel drive...
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power is supplied to four wheels
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help create traction
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Shock absorbers
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Temperatures near the freezing point...
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a bridge roadway freezes before a highway roadway
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Vehicle on a curve tends to.....
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go in a straight line
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If you drive through a curve a peed faster than the speed limit, your vehicle......
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needs more traction to stay on the roadway
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Outside of the curve is higher than the inside of a curve is...
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a banked curve
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Large vehicles have......
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slow stopping ability
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reaction time
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Lengthens if the traffic situation is complex
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Distance a vehicles travels after applying the brakes is.....
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braking distance
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In ideal conditions this rule is used to estimate your total stopping distances is....
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4 second rule
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Force of impact factors are....
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speed, weight, and distance between impact and stopping
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Collisions that occur when a vehicle hits a solid object.....
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3
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A protection restraint that is NOT handled by the occupant is called...
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passive restraint
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An adjusted safety belt....
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fits snugly across the hips and comfortably across the chest
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Air bags are designed to.... |
be used with safety belts
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Air bag....
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automatically inflates to protect a person
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Energy- absorbing feature that protects the driver in a front-end collision is.....
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the steering wheel and column
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Child safety seat is....
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required in all states for children up to a certain age. required in all states for children up to a certain age |
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Standard collision prevention formula
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Be alert
Be prepared Act in time |
