17 - Momentum

17 - Momentum - Momentum For next time: Read: 9.1-9.3...

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Momentum For next time: Read: 9.1-9.3 Homework: Handout
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What is momentum?
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Momentum How hard something is to stop.
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Momentum the mass matters the speed matters p=mv Yes, that’s “p” for momentum!
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hard to stop, small mass m m
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hard to stop, small velocity v v
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P P STOP IT STOP IT! F F t t = = P = P = t t
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Impulse What changes the momentum. Impulse = F t
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Using calculus: Impulse = f i t t IF d t Impulse t = before during after During collision: large forces over a very short time interval Area = Impulse
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Bed of Death
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Which way do we want to stop the sledge hammer? F F t t = = P = P = t t
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Which way does Greg want to stop the sledge hammer? F F t t = = P = P = t t
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Grand Equation of Chapter 9 F F t t = = P P F F = = P P
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Grand Equation of Chapter 9 = = F F t t =
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17 - Momentum - Momentum For next time: Read: 9.1-9.3...

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