# 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 ${\displaystyle {\overrightarrow {v}}}$ -- ${\displaystyle {\frac {\mbox{m}}{\mbox{s}}}}$ or ${\displaystyle \ \ {\mbox{m}}\cdot {\mbox{s}}^{-1}}$ yes momentum ${\displaystyle {\overrightarrow {p}}}$ -- ${\displaystyle {\frac {{\mbox{kg}}\cdot {\mbox{m}}}{\mbox{s}}}}$ or ${\displaystyle \ \ {\mbox{kg}}\cdot {\mbox{m}}\cdot {\mbox{s}}^{-1}}$ yes energy E J ${\displaystyle {\frac {{\mbox{kg}}\cdot {\mbox{m}}^{2}}{{\mbox{s}}^{2}}}}$ or ${\displaystyle \ \ {\mbox{kg}}\cdot {\mbox{m}}^{2}\cdot {\mbox{s}}^{-2}}$ no

Momentum:

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

Kinetic energy:

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