Momentum

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  • Created by: Lotto65
  • Created on: 22-12-15 10:30
What objects have momentum?
Moving objects
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How do you get a bigger momentum?
A greater mass and greater velocity of the object
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What is the unit of momentum?
kgm/s Kilogram metres per second
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What is the equation symbol for momentum?
p
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What is the law of conservation of momentum?
Provided no external forces act on them, when objects interact, the total momentum before equals the total momentum afterwards
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How can you say the law of conservation of momentum more concisely?
The total momentum is unchanged; The change in total momentum is zero
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Give examples of interactions between objects
Collisions or explosions
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How might two objects move after a collision?
Move off together or move apart
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When can you make momentum change?
Adding a force on an object that is able to move or is moving
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The longer the time taken for the momentum to change...
The smaller the force that acts
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What is impact time?
The time which a force acts, usually in a collision
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The shorter the impact time...
The larger the force
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The longer the impact time...
The smaller the force
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What do crumple zones do?
Fold in a collision
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How do crumple zones help?
Increase the impact time so reduce the force on the car and the people in it
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How do seatbelts help?
Increase the time over which the wearer's momentum changes and reduces the force of an impact
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What else folds in a collision (in a car) as well as crumple zones?
Side impact bars
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How do seatbelts and airbags help?
Increase the surface area over which forces act on the body. This slows the change in momentum and reduces the force
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How does a seatbelt increase impact time?
It stretches and stops the wearer being flung forwards
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What does a collapsible steering wheel do?
Collapses if pressed against the driver's chest on impact
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What sort of quantity is momentum? Why?
A vector because it has size and direction
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Describe a way of saying the conditions when the law of conservation of momentum happen?
In a closed system
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Can you have negative momentum?
Yes. In questions that involve movement in different directions, one will be positive and the other negative- YOU DECIDE
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The larger the force... (momentum)
The faster the change of momentum
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How do motorcycle helmets help?
Provide padding so it takes longer for your head to come to a stop. Thus, increasing the impact time and decreasing the force
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Other cards in this set

Card 2

Front

How do you get a bigger momentum?

Back

A greater mass and greater velocity of the object

Card 3

Front

What is the unit of momentum?

Back

Preview of the front of card 3

Card 4

Front

What is the equation symbol for momentum?

Back

Preview of the front of card 4

Card 5

Front

What is the law of conservation of momentum?

Back

Preview of the front of card 5
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