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18.2: Introduction

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  • When lifting weights at the gym, you use energy to move the weights.  Mechanical work occurs when energy is used to move an object a distance.  Mechanical work and energy have the same units of Joules, which indicates that they are closely related.  The use of energy does not always result in mechanical work; an object must be moved for there to be mechanical work done on an object.

    \[W = Fd \nonumber \]

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