3.1 Trial Test and Design Modification
3.1.1 Trial Test and Design Modification
Run Number
|
Run 1
|
Rerun 1
|
Rerun 2
|
Total time of Run
|
3.2 s
|
3.3 s
|
3.5 s
|
Total distance of Run
|
5.6m
|
5.7m
|
6.1m
|
Time for lever to fully release
|
2.8 s
|
2.9 s
|
2.9 s
|
Distance car travels while lever is releasing
|
4.3m
|
4.4m
|
4.5m
|
Observations – did car travel smoothly,
straight, always forward, etc?
|
Swerves left
|
Swerves left but less significant
|
Swerves left but less significant
|
Did lever / string operate smoothly?
|
no, gets stuck at the begining
|
no, needs to be manually released
|
yes
|
Area for improvement (1 only)
|
Snapper arm - lever attachment
|
increase the length of the lever
|
-
|
Possible reason (1 only)
|
Too much friction. Energy transfer must be smoother.
|
The front wheel was unstable
|
The front wheel was unstable
|
Modification made (1 only)
|
attach the lever such that it does not move about and not get in the way of the snapper arm.
|
Secure the wheel
|
Secure the wheel properly
|
MODIFICATION (New Google-sketchup)
 |
We decided to redesign and rebuild the mousetrap car as we felt that the previous one was not good enough.
3.1.2 Photographs of the improved car
Front View
|
Bottom View
|
 * |  * |
Top View when string is winded
|
Side view when string is winded
|
 * |  * |
3.2 Test Data
- All relevant measurements of your car (after modification).
Mass of your car
|
325 g
|
Mass of each wheel (or one of they are all the same)
|
rear: 10g
Front: 5g
|
Wheel diameter
|
12 cm
|
Axle diameter
|
Front: 0.2cm
Back: 1cm
|
Length of string (power stroke)
|
40cm
|
Approx. number of wraps of string
|
≈ 12
|
Length of lever extension
|
16cm
|
Overall length
|
30 cm
|
Overall width
|
10cm
|
Overall height
|
12cm
|
- Data tables showing the results of all 3 trials.
Run Number
|
1
|
2
|
3
|
Total time of Run
|
10s
|
9s
|
10s
|
Total distance of Run
|
> 9m
|
> 9m
|
> 9m
|
Time for lever to fully release
|
3s
|
2s
|
3s
|
Distance car travels while lever is releasing
|
≈ 4m
|
≈ 4m
|
≈ 4m
|
Observations – did car travel smoothly,
straight, always forward, etc?
|
The car travelled with a slight curve to the left
|
The car travelled straight
|
The car travelled with a slight curve to the right then back to the line.
|
Did lever / string operate smoothly?
|
Yes
|
Yes
|
Yes
|
Filename of video recorded is:
|
Trial Test 1
|
Trial Test 2
|
Trial Test 3
|
Graphs of test runs:
Trail Test 1
Trail Test 2
Trail Test 3
3.3 Video Clips
At least 3 best videos are recorded and upload onto Youtube.
The 3 links are pasted here and in the Blog.
Trial Test 1: http://youtu.be/s8brlmPd51U
Trial Test 2: http://youtu.be/1983KTHcAH4
Trial Test 3: http://youtu.be/Wd67vxFvdUw
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