Newton's second law, how to write it?

[LeighV]

Very stupid question, but I am writing out my problem and need this formula;

in typed symbols, so I can copy and paste it into my document. Like √

Hope that makes sense...
Thanks!

 

[ShayanJ]

\Sigma F=ma

 

[Mark44]

\Sigma F=ma

Better - \sum F = ma

This renders as $$\sum F = ma$$
If you use Sigma, the uppercase Greek letter, it renders in the same size as whatever follow it, like so:
$$\Sigma F = ma$$

 

[LeighV]

Perfect thank you!