# Work

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

Or:

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".

When the force is not constant, the correct expression uses integration:

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. The aberrant unit kWh (kilowatt-hour) is sometimes used; this unit is the product of kilowatt, or 1,000 Watts (Joules per second), and hour, or 3,600 seconds.

## References

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