# Momentum Formula

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1. Apr 5, 2015

### Mrs. Callahan

While teaching momentum, we use the formula p=mv.

Every year it comes up as to why the letter p is used in the formula and not other letters or symbols. I have conducted on-line searches and I stumble across explanations that mention Newton and his Principia along with other possible suggestions stated here:

http://2000clicks.com/mathhelp/PhysicsMomentum.aspx

Is there a reliable source out there that can difinitively explain the p in the formula p=mv?

2. Apr 5, 2015