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Conservation of Momentum
6-2
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Momentum is conserved The total momentum before a collision is equal to the total momentum after the collision.
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Momentum is conserved during collisions
Unless stated in a problem, disregard friction Momentum is conserved for objects pushing away from each other.
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Answers to Practice 6D, p. 219
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Newton’s third law leads to the conservation of momentum
During collision for car one During collision for car two
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This equation means that if one object gains momentum the other must lose momentum.
Rearrangement of the equation gives the law of conservation of momentum.
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Forces in real collisions are not constant.
When solving impulse problems use the average force.
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