ELEMENTS OF PHYSICS I
Physics 221

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CHAPTER 7
Linear momentum

NEW CONCEPTS

FORMULAS

Momentum:

\begin{displaymath}\vec p = m\vec v\end{displaymath}

Newton's second law:

\begin{displaymath}\sum \vec F = {\Delta\vec p \over \Delta t}\end{displaymath}

Impulse:

\begin{displaymath}\vec I = \vec F \Delta t = \Delta \vec p\end{displaymath}

Two-body collision:

\begin{displaymath}m_1\vec v_1 + m_2\vec v_2 = m_1\vec v'_1 + m_2\vec v'_2 \end{displaymath}

Elastic collision:

\begin{displaymath}{1\over 2} m_1\vec {v_1}^2 + {1\over 2} m_2\vec {v_2}^2 = {1\over 2} m_1\vec {v'_1}^2 + {1\over 2} m_2\vec {v'_2}^2 \end{displaymath}

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