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P221_2008_week6 - Chapter 7 problems What is the property...

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Chapter 7 problems
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What is the property that a force must possess if it is possible to define a potential energy associated with that force? (About 14 said “conservative, but only a few people explained what that means; 19 were off the mark) there must be a restoring force, a force that pulls an object toward some original position when the object is displaced. In order for a force to define a potential energy, it must act between a particle-like object in the system and the rest of the system. conservative force; When the force does work on an object, the change (delta U) in the potential energy associated with the system is negative of the work done. -change in potential energy is caused by a change in configuration. It must be a conservative force. I.e W1=-W2. The transfer of energy has to be able to be reversed. If it has a potential energy then it is conservative, so it would have to have the conservative force property of irrelevance of path . (This is the key!)
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