123_lab8_atwood

123_lab8_atwood - Physics 123 - Minilab 8 Names: _ _...

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Physics 123 - Minilab 8 Names: _____________________________ ________________________________ WORK-ENERGY THEOREM Goal Compare the change in kinetic energy and the change in potential energy of a system of two masses with the work done by gravity on the system. Introduction The work-energy theorem says that the net work done on a system by external forces equals the change in kinetic energy of the system. In this lab you will measure the change in velocity of two weights connected together by a pulley (an “Atwood machine”) as the heavier weight falls under the force of gravity and pulls up the lighter one. You will calculate the change in kinetic energy of the two weights and compare it with the work done on the two weights by the force of gravity. Neglecting friction, the net work done on the system of two weights should equal the change in their total kinetic energy. Remember that when force and displacement are in opposite directions, the work done by the force on the displaced object is negative. Since gravity is a conservative force, the work done by gravity is also related to the change in
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This note was uploaded on 03/24/2011 for the course PHYSICS 123 taught by Professor Madey during the Fall '08 term at Rutgers.

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123_lab8_atwood - Physics 123 - Minilab 8 Names: _ _...

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