PASCO PS-2138 Goniometer - Manual (Page 13)

Model No. PS-2138 Experiment
13 ®
3. Mount the Motion Sensor in front of
you at shoulder level and about
60 cm from your chest.
4. Hold your arm (as shown in the
picture) so that your forearm will
rotate in a horizontal plane with your
hand in front of the Motion Sensor.
Procedure
1. Start data collection.
2. While keeping your shoulder still, bend your elbow to move your hand
toward the Motion Sensor, then move your hand back toward your
chest. (Don't let your hand get closer than 15 cm from the sensor.)
3. Stop data collection.
Analysis
In this analysis, use units of m/s for velocity and rad/s for angular velocity.
1) Look at graphs of Velocity vs. Time and Angular Velocity vs. Time
together. How are the two graphs related?
2) Create a graph of Velocity vs. Angular Velocity. * Qualitatively
describe the graph.
3) Apply a linear fit to the graph. What is the slope of the best-fit line?
Include units. *
Slope =
*Plot Velocity on the
vertical axis and
Angular Velocity on
the horizontal axis.
*When determining
the units, remember
to consider the
definition of a
radian. Though a
radian is usually
used as a unit of
measure, it is
actually a unitless
quantity. Thus m/rad
is equivalent to m.