General Physics(ppt) Ch 7

General Physics(ppt) Ch 7 - Chapter 7 Work and Kinetic...

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Chapter 7 Work and Kinetic Energy Work is an energy transfer : If energy is transferred to the system (object) Work is positive If energy is transferred from the system (object) Work is negative The work W is the product of the component of the force in the direction of What is Work? the displacement and the magnitude of the displacement : W = F d = Fd cos θ ( scalar or dot product ) Chapter 7 Work and Kinetic Energy An object is displaced on a frictionless, horizontal surface The normal force n and the force of gravity m g do not work F is the only force doing work on the object
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Chapter 7 Work and Kinetic Energy The scalar product of any two vectors A and B : A B AB cos θ A = A x i + A y j + A z k B = B x i + B y j + B z k A B = A x B x + A y B y + A z B z Chapter 7 Work and Kinetic Energy Work done by a varying force x F W x Δ = Δ = Δ = Δ f i f i x x x x x x x dx F x F W 0 lim Δ f i x x x x F W = = f i x x x net dx F W W ) (
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General Physics(ppt) Ch 7 - Chapter 7 Work and Kinetic...

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