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Unformatted text preview: motion into small enough segments (Δx) that we can take the force to be constant in each. Work done by a spring: W s = ∑ΔW i = ∑FΔ x =k∑ x j Δ x OR W = Xf ∫ xi F dx = Xf ∫ xi (kx ) dx = k Xf ∫ xi xdx = ½ k x i 2 – ½ k x f 2 Work done by a spring force: W = ½ k (x i 2 – x f 2 ) W s > 0 Is true if x i  > x f Block ends up closer to equilibrium W s < 0Is true if x i  < x f Block ends up farther away from equilibriumThink of a hand pulling a block away from the spring attached to it. (W a = W s ) W = 0Is true if x i  = x f ...
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This note was uploaded on 04/04/2009 for the course PHYS 1020 taught by Professor Campbellbrown during the Spring '09 term at UWO.
 Spring '09
 CampbellBrown
 Physics, Work

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