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(18) Linear Momentum and Impulse

# (18) Linear Momentum and Impulse - Lecture 18 Linear...

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Lecture 18 Linear Momentum and Impulse

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Momentum and Newton’s Second Law a m F = net ( 29 dt v m d = dt v d m = dt p d = v m p Linear momentum Newton’s second law in terms of linear momentum: dt p d F = net A net force is a transfer of linear momentum. net p F dt =
Impulse Thechange in linear momentum for a certain time interval is called theimpulse J (something like “how much of an effect did the force have by being applied during a given time interval ”). 0 net f t t J p F dt = ∆ = | J| = area t F t 0 t f Equal area F average average F t = average p J F t t = = dp F dt =

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Short-duration collision, largemaximum force. eg. Hitting a hard ball with a bat Long-duration collision, small maximum force. eg. Hitting a soft ball with a bat t F Sameimpulse Samechangein momentum
Units of Momentum and Impulse SI units kg m/s v m p = ∆ = net J p F dt N s It’s the same!

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ACT: Egg tossing In an egg-tossing contest, two people toss a raw egg back and forth. After each successful toss, each person takes a step back. Catching the egg without breaking it becomes harder and harder. Usually the trick is moving your hand down with the egg when you receive it. This works better because: A. It decreases thechangein momentum.
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(18) Linear Momentum and Impulse - Lecture 18 Linear...

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