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<ref>Serway and Beichner, ''Physics for Scientists and Engineers'', Fifth Edition</ref>.
<ref>Serway and Beichner, ''Physics for Scientists and Engineers'', Fifth Edition</ref>.
''W'' = F · d
''W'' = F x d
Or:
Or:
''W'' = F d Cosθ
''W'' = F d sin θ
Where θ is the angle that separates the vectors.
Where θ is the angle that separates the vectors. The second form of the equation is the expanded form of the "cross product" in the first equation. In physics, the cross product "a x b" (read "a cross b") can be rewritten as "a b sin 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.
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.