journal entry (12)

We tested our car again today. It went arond nearly 1¹/₂ times, thats 18 feet.

Here is some of the data we collected.

v_i= 0.6m/s because the distance, 1.5m, divided by the time, 2.5s, is 0.6m/s

v_f= 0.5m/s because the distance, about 5.49m, divided by the time, 10.04s, is about 0.5m/s

a= -0.2m/s² because the final velocity 0.5m/s, minus the initial velocity, 0.6m/s, divided by the distance, about 5.49m, equals about -0.02m/s²

f= -1.55N because the mass, 77.5g, times the acceleration, -0.02m/s², equals -1.55N

As you may have noticed, the results have changed since yesterday. We believe this is because the spring in our spring powered gear box is wearing out so when it spins and turns the gears, it doesn't take as long to unwind. My hypothesis is that if we keep testing the car, it will only go, at most, one lap.

Newtons 2nd Law:F=ma