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How do seat belts reduce injury in a collision.
They stretch a little and convert a person's KE into elastic energy. Spreading the momentum change over a longer period reduces force.
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How do air bags reduce injury in a collision?
They absorb some of a person's KE by squashing up around them.
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Why do some people dislike seat belts?
Risk of chest injury. Could be trapped in the event of a fire. Could be encouraged to drive more recklessly by knowing they are protected by seat belts.
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How does an ABS system work?
Wheel-speed sensors send info to a computer about rotational speed of wheels. Computer controls pressure to brakes, via a pump, to prevent the wheels from locking up. The driving force increases just before the wheels are about to skid.
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What safety features absorb energy?
Brakes - get hot. Crumple zones - change shape. Air bags - inflate and squash. Seat belts - stretch a little.
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What five factors affect fuel consumption?
Speed, road conditions (rough surfaces), energy needed to increase KE, energy needed to do work against friction, how the car is driven (excessive acceleration).
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Which safety features reduce force by reducing acceleration?
Escape lanes, crash barriers, crumple zones, seat belts, air bags
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Other cards in this set

Card 2

Front

How do air bags reduce injury in a collision?

Back

They absorb some of a person's KE by squashing up around them.

Card 3

Front

Why do some people dislike seat belts?

Back

Preview of the front of card 3

Card 4

Front

How does an ABS system work?

Back

Preview of the front of card 4

Card 5

Front

What safety features absorb energy?

Back

Preview of the front of card 5
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