Energy and Sustainability: Robotics cont.

Objective

The objective is this practical work is to compare distance. In fact we made a car traveled a certain distance recorded on a program called LearnSmart and compared it to the distance we could measure with a ruler. In order to see if our measurements were accurate, we calculated the “Error percentage” as so: |distance – distance calculated|/Average  between (distance and distance calculated).

Record: The information we have to retrieve from the experiment

– Wheel rotation

– Time of wheel rotation

– Distance in which the car traveled

General Information:

radius of the wheel: 2 cm = 0.02 m

circumference of the wheel: 2πr = 0,180

Trial #1 (t = time ; d = distance ; d.calc = distance calculated ; v.calc = velocity calculated)

With a power of 50 on each wheel

t = 25 s : d = 33.5 cm = 0.335 m

d.calc = 0.310 m

number of turns = 1.936

v.calc = 0.1549 m.s^-1

%ERROR = 7.75%

Trial #2 (t = time ; d = distance ; d.calc = distance calculated ; v.calc = velocity calculated)

t = 35 s : d = 81 cm = 0.81 m

d.calc = 0.748 m

number of turns = 4.675

v.calc = 0.2493 m.s^-1

%ERROR = 7.79%

Conclusion : We can state that the distance we can measure and the distance given by the computer are not exactly the same. That is why we have such percentage error. Nonetheless we can consider that the two values are compatible.