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© 1997, 2004, 2006 TEXAS INSTRUMENTS INCORPORATED GETTING STARTED WITH THE CBR 2™ SONIC MOTION DETECTOR 17
Activity 2—Match the Graph
Name ___________________________________
Data collection
1. What physical property is represented along the x-axis? _____________________________________
What are the units?
How far apart are the tick marks? ________________
What physical property is represented along the y-axis? _____________________________________
What are the units?
How far apart are the tick marks? ________________
2. How far from the CBR 2™ motion detector do you think you should stand to begin? ____________
3. Did you begin too close, too far, or just right? _____________________________________________
4. Should you walk forward or backward for a segment that slopes up? _________________________
Why? _______________________________________________________________________________
5. Should you walk forward or backward for a segment that slopes down? _______________________
Why? _______________________________________________________________________________
6. What should you do for a segment that is flat? ____________________________________________
Why? _______________________________________________________________________________
Explorations
7. If you take one step every second, how long should that step be? ____________________________
8. If, instead, you take steps of 1 meter (or 1 foot) in length, how many steps must you take? _______
9. For which segment will you have to move the fastest? ______________________________________
Why? _______________________________________________________________________________
10. For which segment will you have to move the slowest? _____________________________________
Why? _______________________________________________________________________________
11. In addition to choosing whether to move forward or backward, what other factors entered into
matching the graph exactly? ____________________________________________________________
____________________________________________________________________________________
12. What physical property does the slope, or steepness of the line segment, represent? ____________
13. For the first line segment, how many meters must you walk in how many seconds? _____________
14. Convert the value in question 13 (the velocity) to metersà1 second: ___________________________
Convert to metersàminute: _____________________________________________________________
Convert to metersàhour: _______________________________________________________________
Convert to kilometersàhour: ____________________________________________________________
15. How far did you actually walk? _________________________________________________________