# Difference between revisions of "Work"

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− | + | 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]] |

## Revision as of 16:25, 15 April 2008

In physics, work refers to the product of force and distance vectors
^{[1]}.

*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 · Meter, or Joule

## References

- ↑ Serway and Beichner,
*Physics for Scientists and Engineers*, Fifth Edition