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Physics LibreTexts

15.22: Momentum

( \newcommand{\kernel}{\mathrm{null}\,}\)

The linear momentum \bf{p} of a body, referred to a frame \Sigma, is defined as

\bf{p} = m\bf{u}. \label{15.22.1}

Here m and \bf{u} are its mass and velocity referred to \Sigma. Note that m is not the rest mass.

Example \PageIndex{1}

The rest mass of a proton is 1.67 % 10-27 kg. What is its momentum referred to a frame in which it is moving at 99% of the speed of light?

Answer = 3.51 % 10-18 kg m s-1.


This page titled 15.22: Momentum is shared under a CC BY-NC 4.0 license and was authored, remixed, and/or curated by Jeremy Tatum via source content that was edited to the style and standards of the LibreTexts platform.

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