Physics 221

ELEMENTS OF PHYSICS I
Physics 221

CHAPTER 6
Work and energy

NEW CONCEPTS

FORMULAS

Work:

$\begin{displaymath}W = Fd\cos\theta\end{displaymath}$

Kinetic energy:

$\begin{displaymath}{\rm KE} = {1\over 2} mv^2\end{displaymath}$

Gravitational potential energy:

$\begin{displaymath}{\rm PE}_{grav} = mgy\end{displaymath}$

Work-energy principle:

$\begin{displaymath}W = \Delta ({\rm KE}) = {1\over 2} mv_2^2 - {1\over 2} mv_1^2\end{displaymath}$

Law of conservation of energy:

$\begin{displaymath}{\rm KE} + {\rm PE} = {\rm constant}\end{displaymath}$

Power:

$\begin{displaymath}P = {\Delta W\over \Delta t}\end{displaymath}$

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