Physics 1 Problem Solutions 101

Physics 1 Problem Solutions 101 - Chapt 10 Collisions 97 a...

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Unformatted text preview: Chapt. 10 Collisions 97 a) simply the sum of the momentum components of a momentum vector. b) a force on an object times the time Δ t it acts on the object: vector J = vector F Δ t . If the force is not constant (which actually the usual case in collisions for example), then vector J = vector F ave Δ t , where vector F ave is the time-averaged force for time interval Δ t . Net impulse yields a new version of Newton’s 2nd law: vector J net = Δ vector p : i.e., vector J net equals the change in momentum of the object. The concept of impulse is used mainly for strong, short-duration forces (i.e., impulsive forces) such as those that occur in collisions and explosions. In such cases, the new version of the 2nd law can be approximated by just using the impulse of the impulsive forces on the left-hand side if they give the only significant contributions to the net impulse. c) a sudden desire....
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