\section{M-2~~Equilibrium of Forces}\label{sec:M2}

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\noindent OBJECTIVE: To experimentally verify vector addition of forces. \\ 

\noindent APPARATUS:
\begin{enumerate}
\item[] \latex{\vspace*{-.08in}}
Circular horizontal force table with $360^\circ$ scale, pulleys, 
weight hangers, slotted masses, protractor, rulers.
\end{enumerate}\latex{\vspace*{-.05in}}

\begin{figure}[h] \centering 
\includegraphics[width=3.0in]{figs/l103/m02-6.eps}
\caption {The horizontal force table}
\end{figure}
 

\noindent PROCEDURE: 
\begin{enumerate}
\item[] \latex{\vspace*{-.08in}}
Choose two concurrent forces, each between 100 and 500 gram 
weight and not in the same direction.  Add these two vectors to find 
the resultant force: use both a
graphical construction and a numerical computation. \\ 

Check your result by setting up the two original forces on the force table, 
and finding experimentally the single force which will hold them in 
equilibrium.  Random errors are due mainly to friction.  You can estimate them by
repeating the measurement several times.  Are your measured values consistent with the
computation and graphical construction? \\

Repeat the experiment but use three different original forces.
\end{enumerate}\latex{\vspace*{-.05in}}

\noindent
QUESTION: If the weight hangers used all have identical masses, can their 
weight be neglected? \\
