Final S06 sln - Final Prof Lanzara (Lecture 200) Problem 1...

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Unformatted text preview: Final Prof Lanzara (Lecture 200) Problem 1 F N y x a) The only external force acting on a blocktable system is a horizontal force F. Note: friction is an internal force for the blocktable system. External work comes from external force. Wexternal=F||x=Fx fr mg table b) Energy dissipated by friction comes from work done by friction. Wfr = Energy lost fr = µ N Fy, net = N − mg = 0, since the block in not accelerating in the y - direction. fr = µ mg The force of friction acts over distance x. Wfr = − µ mg x Energy lost = − µ mg x c) Work-Kinetic energy theorem can be used to solve this part. Wbox=K.E. 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This note was uploaded on 03/09/2010 for the course PHYSICS 7A taught by Professor Lanzara during the Fall '08 term at University of California, Berkeley.

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