# FHSST Physics/Collisions and Explosions/Summary

Collisions and Explosions The Free High School Science Texts: A Textbook for High School Students Studying Physics Main Page - << Previous Chapter (Work and Energy) - Next Chapter (Newtonian Gravitation) >> Tiny, Violent Collisions - Types of Collisions - Explosions - Energy and Heat - Important Equations and Quantities

# Important Equations and Quantities

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

Momentum:

 $\begin{matrix}\overrightarrow{p} = m\overrightarrow{v}\end{matrix}$ (8.13)

Kinetic energy:

 $\begin{matrix}E_{k} = \frac{1}{2}m\overrightarrow{v}^{2}\end{matrix}$ (8.14)