Phys Notes Jan31

Phys Notes Jan31 - Y06 ch6 1 Work(Ch 6 Main ideas and results Work of a constant force F along a straight path W = F s = F s cos SI unit 1 joule

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Y06 ch6 1 Work ( Ch. 6) Main ideas and results: Wo r k o f a constant force F along a straight path W = F · s = Fs cos θ SI unit: 1 joule; Sign of work ;wo rko f sum of forces equals sum of works W F 1 + F 2 = W F 1 + W F 2 Work along a curve C : W = W C F = Z C F · d l = Z C F · d s = Z C F cos θ ds, If the path C is split into two parts, C 1 and C 2 ,then W C F = W C 1 F + W C 2 F Work-energy theorem (for motion under the force F ): work equals to change in kinetic energy W F = K 2 K 1 , where, for a point mass, its kinetic energy is K = 1 2 mv
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Y06 ch6 2 Power is the time rate at which the work is performed P av = W t P inst = dW dt as t 0 SI units: watt = joule/sec, horsepower 1 hp = 550 ft / (lb · s) = 746 W Power delivered by force F acting on a body moving with velocity v : P = F · v
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Y06 ch6 3 Sign of work . Consider What is the sign of the work done by the force F 1 , F 7 , F 5 on displacement s ?
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Y06 ch6 4 ¨ A constant external force
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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 Jan31 - Y06 ch6 1 Work(Ch 6 Main ideas and results Work of a constant force F along a straight path W = F s = F s cos SI unit 1 joule

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