Phys Notes Feb7

# Phys Notes Feb7 - Y8-ch7 1 7 Conservative and...

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Y8-ch7 1 7 Conservative and Nonconservative Forces (Recall) Work of a force F along a curve C : W = Z C F · d l = Z C F · d s = Z C F cos θ ds (Recall) Work-energy theorem (motion under the force): work equals to change in kinetic energy W = K 2 K 1 Aforce F has a potential energy U if the work W F of the force is equal to the difference of potential energy at the endpoints W = ( U 2 U 1 )= U = U i U f If during the motion F is the only force doing work then the total mechanical energy E = K + U is conserved during the motion.

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Y8-ch7 2 ¨ A 2kg mass attached by a string of length ` =1 m to the ceiling is released from rest at an angle of θ 0 =60 with the vertical. Find its maximum velocity. ¨ Two rocks, one of mass m and the other of mass 2m, are dropped from the top of a building. When they hit the ground, 1. both will have the same kinetic energy. 2. the heavier one will have one-fourth the kinetic energy of the lighter one.
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## This note was uploaded on 03/19/2008 for the course PHYS 2305 taught by Professor Tschang during the Spring '08 term at Virginia Tech.

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Phys Notes Feb7 - Y8-ch7 1 7 Conservative and...

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