013 Phys211 S10 Work

# 013 Phys211 S10 Work - 2/22/2010 1 1 Work Phys211 Spring...

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2/22/2010 1 Work Phys211 Spring 2010 2/22/10 1 1 2/22/10 Varying Force in ONE Dimension Convert many small “constant force” intervals to one integral Why is this formula seldom sufficient in a real situation? A.Forces are rarely parallel to motion B.Motion is rarely in a straight line C.All of the above D.None of the above 2 1 () x x W F x dx 2 2/22/10 Multiple Dimensions, Q1 LINE INTEGRAL!!!! Sometimes called a path integral Q: The differential in this integral represents a small change of: A.Position B.Direction C.Radius 2 1 r r W F dr 3

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2/22/2010 2 2/22/10 Problem 6.55 (modified) You put your little sister (mass m ) on a swing whose chains have length L and pull slowly back until the swing makes an angle with the vertical. Show that the work done on your sister by gravity is: cos 1 W mgL 4 2/22/10 Question 2
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## This note was uploaded on 10/31/2010 for the course PHYS 211 taught by Professor Melendorf during the Spring '10 term at Illinois Central.

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013 Phys211 S10 Work - 2/22/2010 1 1 Work Phys211 Spring...

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