Acceleration day two

The RipStik run was measured in the morning using the reversed LRC measurements. Prior to use, the RipStik wheel bearing and swivel bearings were lubricated with WD-40. This may have contributed to the distances and speeds obtained later in the day.

Off of the LRC the 12 meter mark becomes the 0 meter line. The 3 meter mark is visible in the above image. The RipStik is back at the 0 meter line.

A trial run at 10:00 produced the gray data points. Turn around was just barely past 7.5 meters. Self timing interferes with obtaining the maximum possible speed. Zero meters was crossed at an estimated 2.54 m/s, far slower than the 2.80 m/s seen in the fall of 2025 and significantly below the 3.07 m/s of spring 2025. The gray circles are interval velocity calculations. The velocity has a negative slope. 

In class timing was turned over to five students. The result was a higher speed run out that extended out to just past 10.5 meters. Timing was by Leona who captured every line crossing. Five timers were used this term.

The 7.5 meter mark proved serendipitously useful in demonstrating the shape of the data. The run at 10.5 meters was eleven lap times.  Desmos was completed on the field.

Back in the classroom the Desmos regression was developed term by term. The speed was much higher than those of last year at 3.38 m/s. This also yielded a more aggressive deceleration.

The whiteboard shows the linkage between physics and algebra. On the left is the pre-run explanation. On the right the algebra to physics linkage.