FHSST Physics/Collisions and Explosions/Summary

Important Equations and Quantities

Table 8.1: Units commonly used in Collisions and Explosions

Units
Quantity	Symbol	Unit	SI base units		Direction
velocity	$\overrightarrow{v}$	--	$\frac{\text{m}}{\text{s}}$ or $\text{m}\cdot {\text{s}}^{-1}$		yes
momentum	$\overrightarrow{p}$	--	$\frac{\text{kg}\cdot \text{m}}{\text{s}}$ or $\text{kg}\cdot \text{m}\cdot {\text{s}}^{-1}$		yes
energy	E	J	$\frac{\text{kg}\cdot {\text{m}}^2}{{\text{s}}^2}$ or $\text{kg}\cdot {\text{m}}^2\cdot {\text{s}}^{-2}$		no

Momentum:

$\begin{array}{c}\overrightarrow{p}=m\overrightarrow{v}\end{array}$

(8.13)

Kinetic energy:

$\begin{array}{c}{E}_k=\frac{1}{2}m\stackrel{2}{\overrightarrow{v}}\end{array}$

(8.14)