Lecture 17 - Lecture 17 pls-17.1 Impulse, Momentum, and...

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Lecture 17 pls-17.1 Impulse, Momentum, and Center of Mass Media: 1. Foam shape with red dot 2. Ping-pong and tennis balls 1. Impulse – Momentum Theorem Let’s consider a “short-time” interaction between two objects, a baseball bat and a ball, for example. If we multiply the average force F by the time interval t over which the force acts, we obtain the impulse J r t = F J r r Let’s consider the net impulse on an object of mass m , t net net = F J r r . Now N’s 2nd law tells us that t m m m i f net = = v v a F r r r r where i v r and f v r are the initial and final velocities of the object. Thus we have i f net m m v v J r r r = t F ( t ) t F
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Lecture 17 pls-17.2 The product v r m is known as the momentum p r of the object, and so this last equation can be succinctly written as i f net p p J r r r = These last two equations are known as the impulse-momentum theorem . Given the definition of impulse
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Lecture 17 - Lecture 17 pls-17.1 Impulse, Momentum, and...

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