University of Virginia
Physics Department

## Human Motion

A Physical Science Activity

### Student Activity

Materials

• TI-83 graphing calculator. A TI-83 plus is even better, and the TI-82 can be used with different but appropriate software
• CBL system
• Vernier motion detector (or CBR)
• Meter stick

Procedure

PART A: DISTANCE

1. Place the motion detector about mid-chest high facing an area about 4-6 m in length that is fairly free of obstructions like tables and chairs. Using the meter stick and masking tape, mark off the following intervals (in meters) from the front of the motion detector: 0.5, 1.0, 2.0, 3.0, 4.0.
2. Have the program PHYSCI loaded into your TI-83 (or TI-83 plus) calculator.
• Push the key PRGM on the calculator.
• Choose the program PHYSCI on the screen and press ENTER.
• Keep pushing ENTER until you see the MAIN MENU. Select SET UP PROBES from the menu and enter 1 for the number of probes. Press ENTER. We will stop stating press ENTER, because it should be clear when to do this.
• From the SELECT PROBE menu, choose MOTION (you will have to go through MORE PROBES to reach this).
• Choose MATCH from the MAIN MENU that is shown.
• Choose DISTANCE and read the directions on the screen.
3. Follow your teacher's directions and match the motion described or shown on the screen. Try several of the NEW MATCH displays, which are quite different from each other. Take turns operating the calculator and matching the distance vs. time motion in front of the motion detector. When finished, choose QUIT from the OPTIONS menu.

PART B: VELOCITY

Set up the PHYSIC program as before. When in the MATCH menu, choose VELOCITY and follow the directions on the screen. You can again decide to use the SAME MATCH or try a NEW MATCH. In the display, each tick on the velocity scale is 0.25 m/s, and data will be collected for 5 s.

• Try to match the motion shown on the screen. Carefully choose your starting position to allow you to obtain the motion shown. Discuss with your partners before you move what motion you should do.
• After attempting to match the graph shown, critique the result with your partners. Discuss how it could be improved and repeat the SAME MATCH if desired.
• Have each partner try a brand NEW MATCH.
• Continue until finished and when you are done, choose QUIT from the OPTIONS menu. Choose EXIT from the MAIN MENU to exit the program.

Data Sheet

Assessment:

1. Describe in your own words on the right what motion you must do to match the graph shown.

2. Describe in your own words on the right what motion you must do to match the graph shown.

3. Describe in your own words on the right what motion you must do to match the graph shown.

4. Describe in your own words on the right what motion you must do to match the graph shown.

5. Sketch the motion for a bicycle starting from rest, moving down the street, stopping for a second, and then continuing in the same direction.

6. Describe in your own words on the right what motion you must do to match the graph shown.

7. Describe in your own words on the right what motion you must do to match the graph shown.

8. Describe in your own words on the right what motion you must do to match the graph shown.

9. Describe in your own words on the right what motion you must do to match the graph shown.

10. Sketch the velocity for a bicycle starting from rest, increasing its speed gradually for 10 s while moving down the street, moving at this speed for 10 s, and then suddenly stopping in 3 s.