# Work

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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