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Chapter 7 Key Ideas

Chapter 7 Key Ideas. Work is energy transferred to an object. Energy is the ability to make an object move. Σ W = ΔK ΔK = ½mv f 2 - ½ mv i 2 Three ways to approach work/energy problems: Sum all forces, find net work Find the work associated with each force and sum

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Chapter 7 Key Ideas

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  1. Chapter 7 Key Ideas Work is energy transferred to an object. Energy is the ability to make an object move. ΣW = ΔK ΔK = ½mvf2- ½ mvi2 Three ways to approach work/energy problems: Sum all forces, find net work Find the work associated with each force and sum Find the change in kinetic energy, this is equal to the net work For a constant force: W=Fdcosθ For gravitational force W=mgh For a spring force W= ½kxi2- ½ kxf2 General Variable force: F(x)i + F(y)j +F(z)k For a General Variable Force: Work = ∫F(x) dx + ∫F(y) dy + ∫F(z) dz from initial to final values of direction If no ΔK Net Work = 0 Power: rate of work done on an object per unit time P = dW/dt (instantaneous power) P = Δw/Δt (average power) P = F ° v (instantaneous power or if constant force)

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