RipStick deceleration acceleration

The RipStik deceleration and acceleration built off of a lecture introduction first to negative slope, negative velocity, and a return to zero distance. I then suggested a gradually slowing, stopping and returning with acceleration would yield some form of curve. This built off of the last five questions on the velocity quiz last week. I finished the lecture demonstration with the arc of a ball on the board, parabolas, and the suggestion of a quadratic equation. Then I went outside to make one.


I used the same zero post as the week before and a 305 cm on center measurement. After a couple practice runs I did a run that I thought went to 1220 cm out and back. I could not make the times work, became confused, and decided to redo the RipStik run. This time I realized I was turning just past the 915 cm post, so my original data was not faulty. The graphs below retain both sets of data.


A roughly parabolic shape emerged from both runs, both runs have very similar time versus distance profiles.

My velocity changes in a negative linear fashion, decreasing at a roughly constant rate until the very end of the run.

My deceleration remains in the -30 to -60 centimeter per second range until the end of the run.


Just past the turn around at an estimated 1050 centimeters.

Data table:

time (s) distance run one (cm) distance run two (cm)
0 0
1.09 305
2.54 610
4.69 915
6.66 1050
9.06 915
10.76 610
12.21 305
13.59 0
0
0
1.05
305
2.5
610
4.63
915
6.5
1050
8.72
915
10.66
610
12.19
305
13.88
0

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