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Experimental
Use a tape to lay out a course in the parking lot that will permit
a safe "full power" test of the bike rider system and a safe stopping
distance at the end of the course. Stations for people with stop-watches
should be identified either at fixed distances or approximately equal time
intervals apart. If possible, more than one person should be at each measurement
location so that their time-to-distance measurements can be averaged.
For a given pair of runs a single rider should be selected and the
time and distance data collected for a run in each direction. One person should
start the run at which instant all watches are started. As the rider passes
each measuring station, the watch is stopped and the time and position
recorded. All the data is combined to obtain the position-time curve for each
run direction. This procedure is repeated for several riders. Add the flat
plate to the front of the bike and get new position-time data from the same
set of riders.
Collect and share all the data. Use the Excel plotting
program and an x-y scatter plot to display the data. A "trendline"
may be fitted through the data points and an equation for the curve can
be displayed. From measurements of the slope of this position-time curve,
the velocity as a function of time can be evaluated an plotted in the same manner.
From the slope of this second plot, the acceleration as a function of
time is obtained and this should also be plotted. |
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