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15.22: Momentum

Last updated

Aug 8, 2022
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- 15.21: Mass
- 15.23: Some Mathematical Results

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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^-27kg. 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.

Example 15.22.1\PageIndex{1}

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Example $\PageIndex{1}$