lecture25 - Serway & Jewett 9.3 - 9.5...

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Unformatted text preview: Serway & Jewett 9.3 - 9.5 Collisions and Momentum Conservation of Momentum Elastic and inelastic collisions Collisions A collision is a brief interaction between two (or more) objects. We use the word collision when the interaction time t is short relative to the rest of the motion. During a collision, the objects exert equal and opposite forces on each other. We assume these internal forces are much larger than any external forces on the system. We can ignore external forces if we compare velocities just before and just after the collision, and if the interaction force is much larger than any external force. m 1 m 2 v 1, i v 2, i v 1, f v 2, f F 1 F 2 = - F 1 Elastic and Inelastic Collisions Momentum is conserved in collisions. Kinetic energy is sometimes conserved; it depends on the nature of the interaction force. A collision is called elastic if the total kinetic energy is the same before and after the collision. If the interaction force is conservative, a collision between particles will be elastic (eg: billiard balls)....
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lecture25 - Serway & Jewett 9.3 - 9.5...

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