3.1 Trial Test and Design Modification
Run Number
|
Run 1
|
Rerun 2
|
Rerun 3
|
Total time of Run
|
4.5s
|
4.6s
|
5s
|
Total distance of Run
| 5m |
7m
|
8m
|
Time for lever to fully release
| 1s | 1.5s |
1.3s
|
Distance car travels while lever is releasing
| 1m |
2m
|
3m
|
Observations – did car travel smoothly,
straight, always forward, etc?
|
Car travels at a straight line.
|
Car travels straight but moves to the right while travelling.
|
Car travels straight .
|
Did lever / string operate smoothly?
| Lever operated smoothly but not all of the string was used and cause the car to move backwards. |
Lever operates smoothly and the string didn't stop the car from moving.
|
Lever operates smoothy and the string didn't stop the car from moving.
|
Filename of video recorded is:
|
Video 1
|
Video 2
|
Video 3
|
Area for improvement (1 only)
|
We need to prevent the string from moving the car backwards.
|
Car needs to travel in a straight line .
|
Car could travel further.
|
Possible reason (1 only)
|
The string must have tangled up with the wheels causing the action.
|
The wheel might not have been parallel to the chassis
|
The power stroke was too short.
|
Modification made (1 only)
|
We left a bigger space from the wheel and the string to prevent anymore entanglement .
|
We adjusted the wheels to make sure they are parallel.
|
Increased he length of the power stroke.
|
3.2 Test Data
1. All relevant measurements of your car (after modification).
Mass of your car
|
243g
|
Mass of each wheel (or one of they are all the same)
|
32g
|
Wheel diameter
|
12cm
|
Axle diameter
|
3.5cm
|
Length of string (power stroke)
|
33cm
|
Approx. number of wraps of string
|
15
|
Length of lever extension
|
14.5cm
|
Overall length
|
24cm
|
Overall width
|
16cm
|
Overall height
|
12cm
|
2. Data tables showing the results of all 3 trials.
Run Number
|
1
|
2
|
3
|
Total time of Run
|
4.5s
|
4.6s
|
5s
|
Total distance of Run
| 5m |
7m
|
8m
|
Time for lever to fully release
| 1s | 1.5s |
1.3s
|
Distance car travels while lever is releasing
| 1m |
2m
|
3m
|
Observations – did car travel smoothly,
straight, always forward, etc?
|
Car travels at a straight line.
|
Car travels straight but moves to the right while travelling.
|
Car travels straight .
|
Did lever / string operate smoothly?
| Lever operated smoothly but not all of the string was used and cause the car to move backwards. |
Lever operates smoothly and the string didn't stop the car from moving.
|
Lever operates smoothy and the string didn't stop the car from moving.
|
Filename of video recorded is:
| Video 1 |
Video 2
|
Video 3
|
Video 1: http://youtu.be/mpTmfY-dyck
Video 2: http://youtu.be/UoICVCXl3CI
Video 3: http://youtu.be/9CIvxuPT1UA
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