Forces with Constant Velocities: Formulas & More

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I was wondering why can't I use formulas from the "Special Relativity" in cases like:
F=mv^2/r Or F=qv•B
I understeand that in the F=mv^2/r the velicity isn't constat,it changes with the vector,are there any other formulas?
 
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Special relativity relates observations between inertial reference frames.
The presence of an unbalanced force indicates a non-inertial reference frame.
Another, famous, example is gravitation.

There are techniques for handling accelerations in special relativity - you'll get to those later.
 
Ok thanks
 
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