Physics P2 3.7 Car safety.

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What do seat belts and air bags do?
They spread the force across the chest and they also increase the impact time. If a driver's head hits an airbag it changes momentum slowly, so the force on the head is less than it would be if it changed momentum quickly by hitting a steering wheel.
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What do side impact bars and crumple zones do?
They 'give way' or 'fold up' in an impact so increasing the impact time and reduce the forces acting.
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How can we find out the speed of a car before an impact?
We can use the conservation of momentum. After a car crash the police use measurements from the scene and the conservation of momentum to calculate the speed of the vehicles before the collision.
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What do modern cars contain?
A number of safety features designed to reduce the forces on the occupants of the car in a collision.
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How does a seat belt work?
It stops the wearer being flung forward if the car stops suddenly. The seatbelt stretches slightly increasing the impact time and reducing the force.
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What happens to a passenger in a head-on collision if they are not wearing a seat belt?
The continue to move forwards when the car stops and will hit the windscreen.
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What happens to a passenger in a head-on collision if they were wearing a very narrow seat belt?
The narrow seat belt would not spread the force across the passenger's body and might cut them.
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**MAKE SURE THAT YOU CAN EXPLAIN HOW DIFFERENT VEHICLE SAFETY FEATURES WORK IN TERMS OF SPREADING OUT AND REDUCING THE FORCES ON THE OCCUPANTS OF THE VEHICLE**
**LOOK UP AN AIRBAG IN ACTION AND DIAGRAM OF CAR SAFETY FEATURES**
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Other cards in this set

Card 2

Front

What do side impact bars and crumple zones do?

Back

They 'give way' or 'fold up' in an impact so increasing the impact time and reduce the forces acting.

Card 3

Front

How can we find out the speed of a car before an impact?

Back

Preview of the front of card 3

Card 4

Front

What do modern cars contain?

Back

Preview of the front of card 4

Card 5

Front

How does a seat belt work?

Back

Preview of the front of card 5
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