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Line 1: − In [[physics]], work refers to the product of [[force]] and [[distance]] vectors+ − <ref>Serway and Beichner, ''Physics for Scientists and Engineers'', Fifth Edition</ref>. − − ''W'' = F · d − − Or: − − ''W'' = F d cos θ − − Where θ is the angle that separates the vectors. The second form of the equation is the expanded form of the "dot product" in the first equation. In physics, the dot product "a · b" (read "a dot b") can be rewritten as "a b cos θ". − − Work is a transfer of [[energy]]; if ''W'' is positive, there is a transfer of energy ''to'' the system, and if ''W'' is negative there is a transfer of energy ''from'' the system. − − Its units are that of force multiplied by distance, in SI this is [[newton (unit)|Newton]] · [[Meter]], or [[Joule]] − − ==References== − <references/> − [[category:physics]] − [[Category:Mechanics]]
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