Difference between revisions of "Work"

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In [[physics]], work refers to the product of [[force]] and [[distance]] vectors
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<ref>Serway and Beichner, ''Physics for Scientists and Engineers'', Fifth Edition</ref>.
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''W'' = F · d
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Or:
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''W'' = F d cos θ
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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".
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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.
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Its units are that of force multiplied by distance, in SI this is [[newton (unit)|Newton]] · [[Meter]], or [[Joule]]
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==References==
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<references/>
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[[category:physics]]
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[[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

  1. Serway and Beichner, Physics for Scientists and Engineers, Fifth Edition