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REVIEW_exam2

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

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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 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
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
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 f i av f i t t t Unit: rad/s
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REVIEW_exam2 - Momentum r p m(v f v i r = = Fnet t t...

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