PT 2.2 - Testing & Modification

Run Number
Test Run 1
Test Run 2
Test Run 3
Total time of test run / s
4
5
5
Total distance of test run / m
5.8
2
5
Observation 1:
Was the car in steady and stable motion throughout?
Yes
Yes
Yes
Observation 2:
Was the car moving in a straight line mostly?
No
No
Yes
Observation 3:
Did lever and string operate smoothly as well as expected?
Yes
Yes
Yes
State 1 area for modification.
The wheels could be done better.
The wheels could be done better.
The wheels could be done better.
State rationale(s) for the above proposed modification.
The weight of the wheels were too heavy, thus the car didnt travelled as far as expected.
The larger surface of the wheels causes more frictional forces to act on the car, resulting in it being unable to travel far. 
One of the wheels were not moving when the car was travlling forward. 



Modification Photographs
Modification Rationale
First Design



Discs was used as an initial design, however, it was quite heavy. Hence, the inertia increases and it does not move as far. Discs is also not a good idea for the mousetrap vehicle to move far on the road surface.
Modification 1

Balls were used as the wheels, however, it only travelled 2m due as it has too much friction due to the larger contact area with the floor. 
Modification 2

Styrofoam were used as wheels as it was much lighter. It proved to move further as there were lesser weight, the inertia dropped, hence the car can travel further. 

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