lecture14_post

# lecture14_post - Announcements Exam 1 is being graded...

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Exam 1 is being graded. Solutions will be available before end of today. Hope to post grades on e-learning by Friday. You will get back your exam on March 2 nd . If you forgot to bring ID during exam, you must see Prof. Chan with your ID or your exam will not be graded. Announcements

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Momentum of an object
Momentum () fi net mv v tt == ∆∆ p F r r alternative statement of Newton’s second law The time rate of change of momentum of an object is equal to the net force acting on it p t

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Impulse ± When a single, constant force F acts on the object for time t, there is an impulse delivered to the object: t F I = r r I r t F v v m p I i f = = = r r r r r ) ( F t = area under F-t curve Using t p F = r r Impulse
Average Force in Impulse ± Definition: The average force = the constant force that would give the same impulse to the object in the time interval as the actual time-varying force gives in the interval t F p I av = = r r r

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20. A pitcher throws a 0.15-kg baseball so that it
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lecture14_post - Announcements Exam 1 is being graded...

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