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20 GETTING STARTED WITH THE CBR 2™ SONIC MOTION DETECTOR © 2000 VERNIER SOFTWARE & TECHNOLOGY
Activity 3—A Speedy Slide
(cont.)
Parabolic
c. Select Edit (press q) to open the Sample Interval dialog
window.
d. Enter 0.2 to set the time between samples in seconds.
e. Select
Next (press q) to advance to the Number of
Samples
dialog window.
f. Enter 25 to set the number of samples. Data collection will
last for 5 seconds.
g. Select
Next (press q) to display a summary of the new
settings.
h. Select
OK (press s) to return to the main screen.
Í Take your preliminary data-collection positions.
a. One member of the group should first go up the slide steps and sit at the top of
the slide.
b. A second person, while holding the
CBR 2™ motion detector, should go high
enough on the slide steps to hold the
CBR 2™ motion detector behind the person
who will slide.
c. The third person should stand on the ground next to the slide, while holding the
calculator and interface.
Î Take your final data-collection positions.
a. The slider, while holding on, should move forward enough to allow a 15-cm
distance between his or her back and the
CBR 2™ motion detector.
b. The person holding the
CBR 2™ motion detector should hold the CBR 2™ motion
detector steady and aim it at the slider’s backside.
c. The person holding the calculator and interface should move to a comfortable
position that does not cause a pull on the
CBR 2™ motion detector cable.
Ï Collect data.
a. Select
Start (press q) to begin data collection.
b. The slider should begin to slide as soon as a clicking is heard.
c. When data collection is done for this trial, the person with the
CBR 2™ motion
detector should come down to the ground.
Caution: No student should attempt to pass another person while he or she is on
the steps.