3.1 Trial Test and Design Modification
Run Number
|
Run 1
|
Rerun 1
|
Rerun 2
|
Total time of Run
|
6s
|
5s
|
6s
|
Total distance of Run
|
6m
|
7m
|
9.5m
|
Time for lever to fully release
|
2s
|
2s
|
2s
|
Distance car travels while lever is releasing
|
3m
|
3.4m
|
4.6m
|
Observations – did car travel smoothly,
straight, always forward, etc?
|
It travelled smoothly however it swerved.
|
It travelled smoothly though a little swerving occured.
|
It travelled smoothly.
|
Did lever / string operate smoothly?
|
Yes
|
Yes
|
Yes
|
Filename of video recorded is:
| |||
Area for improvement (1 only)
|
Steadiness of the wheels.
|
The type of string attached to the lever.
|
The friction on the back wheels
|
Possible reason (1 only)
|
With the wheels moving about, the car keeps turning away from the straight line.
|
Since there was little friction on the string, the string was unable to coil onto the axle of the back wheels.
|
There was little friction on the back wheels, thus causing the car to slant and the back wheels to skid as it moved.
|
Modification made (1 only)
|
Added a stopper to prevent the wheels from moving about.
|
We change our string to a thinner and rougher one.
|
We pasted strips of anti-slip mats onto the back wheels of the car.
|
MODIFICATION (New Google-sketchup)
Modfication 1 Modification 2  Modification 3  |
3.2 Test Data
- All relevant measurements of your car (after modification).
Mass of your car
|
326g
|
Mass of each wheel (or one of they are all the same)
|
5g
|
Wheel diameter
|
12cm
|
Axle diameter
|
2cm
|
Length of string (power stroke)
|
35cm
|
Approx. number of wraps of string
|
7
|
Length of lever extension
|
20cm
|
Overall length
|
32cm
|
Overall width
|
12cm
|
Overall height
|
13cm
|
- Data tables showing the results of all 3 trials.
Run Number
|
1
|
2
|
3
|
Total time of Run
|
6s
|
5s
|
6s
|
Total distance of Run
|
8m
|
9m
|
9.7m
|
Time for lever to fully release
|
2s
|
2s
|
2s
|
Distance car travels while lever is releasing
|
4m
|
4.5m
|
4.8m
|
Observations – did car travel smoothly,
straight, always forward, etc?
|
It travelled smoothly however it swerved.
|
It travelled smoothly though a little swerving occured.
|
It travelled smoothly.
|
Did lever / string operate smoothly?
|
Yes
|
Yes
|
Yes
|
Filename of video recorded is:
|
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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