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# on23 - Solution for On-Line Homework 23 Gravitation II...

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Solution for On-Line Homework 23 Gravitation II Solution to On-Line Homework Problem 23.1() Problem: What can be said about the work done by a conservative force along a closed path? Select One of the Following: (a) It is the force times the total distance travelled, 2 πR if the path is circular. (b-Answer) It is the force times the total distance travelled in the direction of the force, but since the path is closed, the total work is zero. (c) There is no way to tell from this information, since the path probably isn’t circular, so the path is not always perpendicular to the force. Solution The total work is zero. Remember that work is always done by a force outside the system. If we instead include the object exerting the force in the system and talk about potential energy, then the potential energy an object has at point A will always be the same, no matter what route the object takes to get there. These are basically two different ways to say the same thing; the difference is which way the system is defined.

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on23 - Solution for On-Line Homework 23 Gravitation II...

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