3. Testing and Modification

3.1 Trial Test and Design Modification
Run Number
Run 1
Rerun 1
Rerun 2
Total time of Run
2s
1s
1s
Total distance of Run
2m
1m
>1m
Time for lever to fully release
2s
1s
1s
Distance car travels while lever is releasing
2m
1m
>1m
Observations – did car travel smoothly,
straight, always forward, etc?
The car travelled smoothly in a straight line. However, the wheels were not attached tightly enough to the axle and did not always turn along with the axle.
The car stopped immediately after the rod snapped back. The car travelled in a straight line.

The car travelled for a short distance after the rod snapped back and then moved backwards slightly. The car travelled in a straight line.
Did lever / string operate smoothly?
Yes.
No.
Yes.
Filename of video recorded is:
Mousetrap Car Run 1 by S3-06 Group C
Mousetrap Car Rerun 1 by S3-06 Group C
Mousetrap Car Rerun 2 by S3-06 Group C
Area for improvement (1 only)
Wheels could be glued onto the axle.
The string could be thickened and lengthened.
The rod could be lengthened.
Possible reason (1 only)
Wheels would be more securely attached to the axle and would turn with the axle.
With more string wrapped around the axle, the axle would turn more times and the car would move further. A thicker string would not snap as easily either.
The tension in the string would have been larger and thus there would be more energy for the car to move.
Modification made (1 only)
Car still moved smoothly and thus no modification was required at this point.
String was thickened and lengthened.
Rod was lengthened.
MODIFICATION  (New Google-sketchup)

3.2 Test Data
1.     All relevant measurements of your car (after modification).
Mass of your car
314g
Mass of each wheel (or one of they are all the same)
25g
Wheel diameter
5.5cm
Axle diameter
0.2cm
Length of string (power stroke)
60cm
Approx. number of wraps of string
35
Length of lever extension
34.5cm
Overall length
28cm
Overall width
20.5cm
Overall height
7cm

2.     Data tables showing the results of all 3 trials.
Run Number
1
2
3
Total time of Run
2s
2s
3s
Total distance of Run
>2m
2m
3m
Time for lever to fully release
2s
2s
3s
Distance car travels while lever is releasing
>2m
2m
3m
Observations – did car travel smoothly,
straight, always forward, etc?
The car travelled smoothly in a straight line.
The car travelled smoothly in a straight line.
The car travelled smoothly in a straight line.
Did lever / string operate smoothly?
Yes.
Yes.
Yes.


3.3 Video Clips  
At least 3 best videos are recorded and upload into Youtube.
The 3 links are pasted here and in the blog.

http://www.youtube.com/watch?v=WuyIPSHvuCA
http://www.youtube.com/watch?v=RozjBoQavF8
http://www.youtube.com/watch?v=CU4430Sw4Hg

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