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W = (F cosθ)x
This new equation has similar form to the old equation, but provides a more
complete description.
If θ = 0 , then cosθ = 1 and we have our first equation.
Also, this equation ensures that it does not take into account any forces
acting on a moving particle that do not do any work. Consider the normal
force acting on a ball rolling across a horizontal floor.
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 Fall '09
 
 Force

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