Lab 5 - Conservation of Linear Momentum in One Direction

Lab 5 - Conservation of Linear Momentum in One Direction -...

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Unformatted text preview: PHYSICS 133 EXPERIMENT NO. 5 CONSERVATION OF LINEAR MOMENTUM IN ONE DIMENSION In this experiment, we study linear momentum conservation in one- dimensional collisions using the air track. In addition, we study the nature of the principle of action- reaction. NOTE: Perform collisions with the gliders moving SLOWLY (no more than 0.5m/s). If there is an audible "clank" (caused by a glider coming into contact with the air track) you will have introduced an external force, momentum of the gliders will not be conserved, and the equipment might be damaged. Equipment 1 air track, 1 glider with photogate, additional weighted gliders with Velcro, 1 light sensor, 1 interface box, 1 computer with timing program, rubber bands. Method By allowing two gliders to collide under varying conditions, we test the validity of several ideas: (1) The center of mass of a system initially at rest remains at rest when no external force acts on it. (2) Each action has an equal and opposite reaction (Newton's Third Law). (3) Linear momentum is conserved when external forces are negligible. By measuring the velocity of the photogate glider before and after totally inelastic collisions, the momentum of the two-glider system is calculated. After verifying conservation of momentum, the energy loss in collisions will be studied. Procedure I. Center of Mass and Action & Reaction. Level the air track as before. Place two non-photogate gliders of equal mass on the air track with the Velcro strips facing each other and connect them with a rubber band using the screws on top of the gliders. Separate the gliders by a distance slightly greater than the relaxed length of the rubber band (so that the gliders will not collide too hard when they are released). Locate and mark (with masking tape) the center of mass of the two- glider system. Now release the gliders simultaneously. (This may take some practice. Be sure the gliders do not collide too hard! ) Repeat with gliders of unequal mass. Q1. What is the momentum of the system before the gliders are released? Q2. How far has each glider moved? How much has the center of mass moved? Is it at the point of collision? Q3. What is the momentum of the system after the collision? Q4. Compare the momentum of each glider while they are moving. Q5. Do the relative masses of the gliders affect your answer to questions 1-4? Q6. On the basis of what you have observed, what can you say about the forces acting between the gliders?...
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This note was uploaded on 09/26/2008 for the course PHY 131 taught by Professor Rijssenbeek during the Fall '03 term at SUNY Stony Brook.

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Lab 5 - Conservation of Linear Momentum in One Direction -...

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