Module 5 On Work and Energy

variable	quantity	SI unit
\( W =Fx \)	Work done by a constant force \( \vec{F}\) over displacement \( \vec{x}\). \( \vec{F}\) is parallel to \( \vec{x}\) .	\( J \; (joule) \)
\( W =mgh \)	Work done by a constant force \( \vec{F}\) over displacement \( \Delta \vec{y}\). \( F=mg \quad \) and \(\quad \Delta y = h\) .	\( J \; (joule) \)
\( \Large P=\frac{mgh}{t} \)	Power is rate of doing work which is the ratio of work done and time elapsed.	\( W (watt) \) or \( joule/sec \)
\( \Large P= F_{net} \; \bar{v} \)	Power can also be expressed in terms of the net force acting on an object and its average speed.	\( W \)

\( \color{BrickRed}{Formulas:} \)

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