conservation of momentum

conservation of momentum - CONSERVATION OF MOMENTUM Object:...

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41 CONSERVATION OF MOMENTUM Object: To study the law of conservation of momentum by analyzing collisions in two dimensions. Apparatus: Ramp, two steel balls, one glass ball, C-clamp, plumb bob, shelf paper (50cm x 50cm), masking tape, meter stick, protractor, carbon paper (2 sheets). Theory: The momentum of an object is defined as p = m v where m is the mass and v the velocity. If ball A with momentum p (figure #1) strikes ball B at rest, and if the momenta of balls A and B are p A and p B after the collision, then conservation of momentum requires that p = p A + p B (1) Note: This is a vector relation so directions are involved. Since momentum is conserved this implies that the vector quantities (i.e. Σ p x ’s and Σ p y ’s ) must be conserved. A typical collision is sketched in the figure below. Before After Figure #1 The vector diagram for the collision looks like: Figure #2 In this experiment equation #1 will be verified for several different kinds of collisions. In order to do so, p , p A , and p B must be measured. Consider first a collision in which balls A and B have the same mass. Since both A and B have the same mass, and B is initially at rest it can be shown that after the collision
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This note was uploaded on 09/21/2009 for the course PHYS 180 taught by Professor Mccall during the Spring '09 term at Nevada.

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conservation of momentum - CONSERVATION OF MOMENTUM Object:...

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