3.1 Trial Test and Design Modification
Run Number
|
Run 1
|
Rerun 1
|
Rerun 2
|
Total time of Run
| 11s | 10s | 10s |
Total distance of Run
| >13m | >15m | >15.5m |
Time for lever to fully release
| 5s | 5s | 5s |
Distance car travels while lever is releasing
| 10m | 10.5m | 10.5m |
Observations – did car travel smoothly,
straight, always forward, etc?
| Smoothly, but turned right | Smoothly, but turned slightly right | Smoothly, but turned slightly right |
Did lever / string operate smoothly?
| Yes | Yes | Yes |
Filename of video recorded is:
| IMG 0640 RUN 1 IMG 0647 RUN 1 | IMG 0651 RUN 2 | IMG 0649 RUN 3 |
For all 3 runs; Modification was made on RERUN 1
Area for improvement (1 only)
Car turned to the right
| |||
Possible reason (1 only)
String wrapped around the rear axle was positioned nearer to the left, meaning that there was more tension force on the left than the right - thus when the level was releasing, the string pulled the rear axel on the left side up, causing the left rear wheel to rise up from the ground, balancing on only the front wheels & right rear wheel, causing it to move to the right. | |||
Modification made (1 only)
|
String wrapped around the rear axle was positioned nearer to the centre, so that the force (tension) pulling the axle will be balanced, thus the left wheel will not be pulled up from the ground, causing the car to move striaght, instead of moving to the right.
MODIFICATION (New Google-sketchup)
Modification made: String wrapped around the rear axle was positioned nearer to the centre, so that the force (tension) pulling the axle will be balanced, thus the left wheel will not be pulled up from the ground, causing the car to move striaght, instead of moving to the right.
Modification made: String wrapped around the rear axle was positioned nearer to the centre, so that the force (tension) pulling the axle will be balanced, thus the left wheel will not be pulled up from the ground, causing the car to move striaght, instead of moving to the right.
| 3.2 Test Data |
- All relevant measurements of your car (after modification).
Mass of your car 310g
| |
Mass of each wheel (or one of they are all the same) 20g, 11g
| |
Wheel diameter 6cm
| |
Axle diameter 0.3cm
| |
Length of string (power stroke) 25cm
| |
Approx. number of wraps of string 35
| |
Length of lever extension 20cm
| |
Overall length: 25cm
| |
Overall width: 14cm
| |
Overall height: 10cm
|
- Data tables showing the results of all 3 trials.
Run Number
|
1
|
2
|
3
|
Total time of Run
| 11s | 10s | 10s |
Total distance of Run
| >13m | >15m | >15.5m |
Time for lever to fully release
| 5s | 5s | 5s |
Distance car travels while lever is releasing
| 10m | 10.5m | 10.5m |
Observations – did car travel smoothly,
straight, always forward, etc?
| Smoothly, but turned right | Smoothly, but turned slightly right | Smoothly, but turned slightly right |
Did lever / string operate smoothly?
| Yes | Yes | Yes |
Filename of video recorded is:
| IMG 0640 RUN 1 IMG 0647 RUN 1 | IMG 0651 RUN 2 | IMG 0649 RUN 3 |
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.
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