REVIEW_exam2 - Momentum r p m(v f v i ) r = = Fnet t t...

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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
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Collision of 2 objects
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Conservation of Momentum ± Momentum is conserved for the system of objects. You must define the isolated system ± Assumes only internal forces are acting during the collision ± Can be generalized to any number of objects
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Types of Collisions ± Momentum is conserved in any collision ± Inelastic collisions ± Kinetic energy is not conserved ± Some of the kinetic energy is converted into other types of energy such as heat, sound, work to permanently deform an object ± Perfectly inelastic collisions occur when the objects stick together ± Not all of the KE is necessarily lost
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Average Angular Speed • The average angular speed, ω , of a rotating rigid object is the ratio of the angular displacement to the time interval fi av tt t   Unit: rad/s
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This note was uploaded on 09/07/2011 for the course PHY 2053 taught by Professor Buchler during the Spring '06 term at University of Florida.

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REVIEW_exam2 - Momentum r p m(v f v i ) r = = Fnet t t...

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