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# Rearranging Formulae - PowerPoint PPT Presentation

Rearranging Formulae. Why rearrange formulae?. Sometimes to find answers to calculations we need to rearrange the formulae to get the unknown we want. There is a methodical way to do this using the ideas we use for solving equations by working backwards. -u. ÷ a. -u. ÷ a.

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## PowerPoint Slideshow about ' Rearranging Formulae' - neorah

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Presentation Transcript

### Rearranging Formulae

Sometimes to find answers to calculations we need to rearrange the formulae to get the unknown we want.

There is a methodical way to do this using the ideas we use for solving equations by working backwards.

÷ a

-u

÷ a

Example: The final speed of an object is given by the equation v = u + at, where u = initial speed,

a = acceleration and t = time.

What is the formula for finding the time?

If v = u + at then we need to move all the letters associated with t onto the other side of the equation

v = u + at subtract the u first as it is not connected

with t

So we now have

v – u = at at means a x t so we need to now

divide by the a

So the final formula for t is t = v – u

a