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phys: define work

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eggy 2020-11-03 10:53:59 -05:00
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@ -427,7 +427,7 @@ If both objects on both sides of a pulley have the same mass, Newton's third law
### Work
Work is a scalar value measured in **joules** ($\text{J}$) and is equal to the dot product (a special type of multiplication between vectors) of force and displacement, where $\theta$ is the **angle between the two vectors**, such that:
Work is a scalar value measured in **joules** ($\text{J}$) and represents the energy transferred to an object or system. It is equal to the dot product (a special type of multiplication between vectors) of force and displacement, where $\theta$ is the **angle between the two vectors**, such that:
$$W=\vec{F}\cdot\vec{d}\cdot\cos\theta$$
When work is done **by** exactly one force, the above is formula is used. However, when calculating for work **on** an object, or **total work**, the sum of all forces ($\Sigma F$) should be used instead of $F$.