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Phys Notes Jan31 - Y06 ch6 1 Work(Ch 6 Main ideas and...

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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 θ SI unit: 1 joule; Sign of work ; work of 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 2 .
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