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7 Cards in this Set
- Front
- Back
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What kind of quantity is momentum? |
Vector |
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Total momentum before = .... |
Total momentum after |
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If one vehicle is moving to the right, and one is moving to the left, how would I differentiate between them in a calculation? |
One would have a negative sign. |
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A lorry with a mass of 500kg is travelling right at a speed of 4 m/s. A lorry with a mass of 1500kg is travelling left at a speed of 1.5m/s. When the two lorries crash, which way will the lorries by travelling and what will the velocity be? |
Left 0.125 m/s (See revision book if you don't understand!!) |
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Force = .... |
Change in momentum / time |
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A car travelling at 20m/s collides with a stationary lorry and is brought to rest in just 0.02 seconds. A woman in the car has a mass of 50kg. She experiences the same deceleration when she comes into contact with a hard surface in the car (such as the dashboard of windscreen). What force does the woman experience? |
50,000 N (look in revision notes if you don't understand!!) |
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What safety feature of cars aims to reduce the force in a collision? How does it work? |
Crumple zones The front of the car takes longer to crumple as it is designed to crumple in a specific way. As the time for the momentum to change is increased, the force is decreased. |
