# Force, energy, and power

1. Nov 27, 2013

### XshulderX

Hey today in class the subject was biomecanics.

My teacher wais that

Power = Masse * accelleration

This puzzles me becuase why is power not = energy?

I my World it can't be the same because Einstein said:

E = M * C2

Is power ≠ Energy or should my teachers definertion of power be changes to Power = Masse * accelleration2

2. Nov 27, 2013

### SteamKing

Staff Emeritus
Somebody is off.

Force = mass * acceleration. (F = ma, one of Newton's Laws)

And power is not the same thing as energy anyway.

3. Nov 27, 2013

### Staff: Mentor

If anything, power=mass*acceleration*speed.

\begin{align} power &= \frac {work} {time}\\ &= \frac {force \times displacement}{time}\\ &= mass \times acceleration \frac {displacement}{time}\\ &= {mass \times acceleration \times speed} \end{align}

(not that it makes much sense in terms of solving any particular problem, but at least units are OK)