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 WF sF 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 d d s i G G ) g yy 3. Work done by gravity for motion from position 1 to position 2: Wm 12 ( g = g s . If the displacement is along an incline: sin g θ = g s for down the incline and sin g = x x =− s for up the incline. 4. Work done by a linear spring for motion from position 1 to position 2: Wk 22 (1 / 2) ( ) s 5. Work done by friction: WN fk μ Example 1. A force F = 200 N is applied on the 20 Kg block that is attached
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