1 Force and Momentum

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Unit and symbol for momentum
kgms-1 or Ns. p.
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Newton's 1st law of motion
An object's momentum will not change unless an external resultant force acts on it.
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Newton's 2nd law of motion
The rate of change of momentum is proportional to the force acting on it.
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Newton's 3rd law of motion
When two objects interact with each other, they exert equal and opposite forces on each other.
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What happens to the impact force if the duration of impact is reduced?
It increases, as the same change in momentum is occurring but over a smaller time.
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What is impulse?
The change in momentum.
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What is the change in momentum for a rebound?
-2mu
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What does the area under a force-time graph represent?
The impulse or change in momentum.
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What is the change in momentum for an oblique rebound?
-2mucos(theta)
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What is the principle of conservation of momentum?
In a system, the total momentum doesn't change unless there is an external force acting on it.
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What is the difference between an elastic and inelastic collision?
Elastic kinetic energy is conserved, inelastic it isn't.
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Other cards in this set

Card 2

Front

Newton's 1st law of motion

Back

An object's momentum will not change unless an external resultant force acts on it.

Card 3

Front

Newton's 2nd law of motion

Card 4

Front

Newton's 3rd law of motion

Card 5

Front

What happens to the impact force if the duration of impact is reduced?

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