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{\large Name:}
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\centerline{\bf \Large Investigating Force, Acceleration and
Velocity}
\centerline{adapted from the work of Prof. Dewey Dykstra of
Boise State University}
\bigskip




\begin{itemize}
\item Consider  a cart being pushed along a horizontal table at
{\bf constant velocity}.  Sketch below at three different times
all of the forces you belive are acting on that cart.  Be sure
to indicate the relataive size of those forces by the relative
size of the vectors.

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\item Discuss as a group what forces are acting.  Modify your
diagrams above if your group members mention other forces that
you believe are acting on the cart.

\item Discuss as a group how these forces combine to make the
cart move at constant velocity.  Write your group conclusions
below.

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\item Consider  a cart being pushed along a horizontal table at
 {\bf constant acceleartaion}.  Sketch below at three different
times all of the forces you belive are acting on that cart.  Be
sure to indicate the relataive size of those forces by the
relative size of the vectors.

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\vfill
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\item Discuss as a group what forces are acting.  Modify your
diagrams above if your group members mention other forces that
you believe are acting on the cart.

\item Discuss as a group how these forces combine to make the
cart move at constant accleration.  Write your group conclusions
below.

\vfill
\clearpage

\item Consider a cart on a horizontal table being pulled by an
object which hangs over the table.  Sketch below the force,
accleration, velocity, and position of the cart on the table.
(Ignore the scales on the plots!)

\psfig{figure=Patsy:Documents:pictures:cart.on.table.eps,height=1.68in,width=3.44in}

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\psfig{figure=blank.plots.eps,width=6in}

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\item Explain why you drew your predictions as you did.

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\item {\bf Procedure:}  Now you can check the predictions that
you made on the last page.  Be sure to do this for several
different masses of the hanging objects.  Print plots for each
of your runs.


\item {\bf Preparing the equipment:}
\begin{itemize}
\item {\it Getting the track ready: } Bring the
track down so that it is about 8 inches off the table.  Support
the middle of the track with an adjustable jack.  {\bf Be sure
that the jack is not pressing the track upward, merely keeping
it from sagging}.  Check that the track is level with the one of
the levels in the room.
\item {\it Getting the equipment:} Make sure you have a cart
with an attached force sensor, two bar weights, a long string, a
weight hanger and three or four small weights (about $20$ gm
each).
\item {\it Preparing the computer and force probe:}  Turn on
the computer and the ULI (universal lab interface).  Plug the
force probe into {\tt Din 1}.  Launch MacMotion.  Display four
graphs at once (position, velocity, acceleration, and force). 
Make the graphs large!
\item  {\it Calibrating the Probe:} Under the {\tt Collect}
menu, choose {\tt  Calibrate Force Probe} (at the bottom), and
then {\tt Calibrate Now}.  It will ask you to remove all force
from the probe.  Do so.  Then it will ask you to apply a known
force.  Hang a
$1000$ gm weight, with a force of $9.81$ Newtons. Type
this value in.  [You can check the calibration by hanging a
different weight, and clicking on start.  The force plot should
show the appropriate constant value.]
\end{itemize}


\item What can you conclude from these experiments about how
forces combine to give constant acceleration?  to give constant
velocity?

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\end{itemize}







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