Texas Instruments CBR 2 manual Activity 3-ASpeedy Slide cont, Parabolic

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.

ÍTake 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.

ÎTake 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.

ÏCollect 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.

20 GETTING STARTED WITH THE CBR 2™ SONIC MOTION DETECTOR © 2000 VERNIER SOFTWARE & TECHNOLOGY