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- Work occurs only when a force succeeds iin moving the object it acts on.
- The amount of work done is equal to the component of force parallel to the direction of motion times the distance the object moves.
W = Fd
- If there is an angle between the force aand displacement vectors than:
W = (F cos θ) (d) = Fd cos θ
- A force perpendicular to the direction oof an object's motion produces no work.
- Work is a scalar quantity (no direction)) even though it depends on two vectors.
- The unit of work in SI is the Newton-metter, called the Joule (J) after Dr. Jimmy Joule.
-Other units of work include:
1 erg = 10-7 J
1 ft*lb = 1.355 J
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