# Simple formula, please help

1. May 19, 2008

### lesodk

I have this formula in my book:
$$$a = - \omega x^{2}$$$
Can anyone help me show how to show that this formula is true?

2. May 19, 2008

### rock.freak667

What does that formula relate to?

If it is supposed to relate to SHM then the equation is supposed to be $a=- \omega^2 x$

3. May 19, 2008

### lesodk

yes sorry, that was what i meant. Do you know how to show the formula from the equations of motion?

4. May 20, 2008

### alphysicist

The equation of motion is:

$$m a = - k x$$

What is the definition of $\omega$? Then solve the equation of motion for a.

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