Ex_work - Work 1 Work done by a constant force in 1-D...

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Work 1. Work done by a constant force in 1-D motion: cos t W F s F s F s φ = = = i G G W = F s if the force and displacement have the same direction, W = F s if they have opposite directions. 2. Work done by a varying force or work done by a force in 2-D motion: t W F d s F d = = s i G G ) g y y 3. Work done by gravity for motion from position 1 to position 2: W m 1 2 ( g = gs . If the displacement is along an incline: W m sin g θ = gs for down the incline and W m sin g = θ x x = s for up the incline. 4. Work done by a linear spring for motion from position 1 to position 2: W k 2 2 1 2 (1/ 2) ( ) s 5. Work done by friction: W N f k μ = − Example 1. A force F = 200 N is applied on the 20 Kg block that is attached
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