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lecture14_09

# lecture14_09 - Announcements 1 HW5 due Feb 25 2 Midterm 1...

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1 1. HW5 due Feb 25. 2. Midterm 1 is being graded. 3. Hope to post grades and solutions by Monday 4. If you forgot to bring ID during exam, you must see Prof. Chan with your ID or your exam will not be graded. Announcements Momentum ( ) f i net m v v t t = = 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 Impulse When a single, constant force acts on the object for time t, there is an impulse delivered to the object: t F I = r r I r ( ) f i net m v v t t = = p F r r p r = ) ( i f v v m r r = F t = area under F-t curve Average Force in Impulse The average force can be thought of as 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 Conservation of Momentum Momentum in an isolated system in which a collision occurs is conserved A collision may be the result of physical

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lecture14_09 - Announcements 1 HW5 due Feb 25 2 Midterm 1...

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