3.1 Trial Test and Design Modification
Run Number
|
Run 1
|
Rerun 1
|
Rerun 2
|
Total time of Run
|
2.0 s
|
2.3 s
|
2.8 s
|
Total distance of Run
|
1.31 m
|
1.65 m
|
3.00 m
|
Time for lever to fully release
|
0.8 s
|
It did not fully release.
|
2.3 s
|
Distance car travels while lever is releasing
|
0.70 m
|
1.30 m
|
2.20 m
|
Observations – did car travel smoothly, straight, always forward, etc?
|
The car jerked as it travelled forward.
|
The car travelled fairly smoothly, but it can be improved.
|
The car travelled fairly smoothly, but it can be improved.
|
Did lever / string operate smoothly?
|
No. The lever's movement was too fast and sudden
|
No. The lever did not fully release
|
Yes.
|
Filename of video recorded is:
|
Phy PT Test 1
|
Phy PT Test 2
|
Phy PT Test 3
|
Area for improvement (1 only)
|
The lever snapped (released too quickly) during the run.
|
The lever did not release fully.
|
The car does not travel far enough.
|
Possible reason (1 only)
|
The lever was too short and weak. Thus, the tension of the spring caused it to snap.
|
Glue had solidified around some parts of the lever, thus obstructing the release.
|
It needs to travel at least
5.0 m.
|
Modification made (1 only)
|
Change the lever to a wooden pencil
|
Melt the glue and reattach the lever.
|
Change the front wheels from CD to bottle caps.
|
Modification (New Google-sketchup)
3.2 Test Data
1. All relevant measurements of your car (after modification).
1. All relevant measurements of your car (after modification).
Mass of car
| |
Mass of each wheel
|
Front wheel:
Back wheel: 14.4g
|
Wheel diameter
|
Front wheel: 2.5cm
Back wheel: 12cm
|
Axle diameter
|
0.6cm
|
Length of string (power stroke)
| |
Approx. number of wraps of string
|
14
|
Length of lever extension
|
12cm
|
Overall length
|
30.0cm
|
Overall width
|
25.3cm
|
Overall height
|
13.2cm
|
2. Data tables showing the results of all 3 trials.
Run Number
|
Run 1
|
Run 2
|
Run 3
|
Total time of run
|
2.3 s
|
2.8 s
|
2.4 s
|
Total distance of run
|
2.6 m
|
3.2 m
|
2.7
|
Time for lever to fully release
|
1.5 s
|
2.4 s
|
1.8 s
|
Distance car travel while lever is releasing
|
1.9 m
|
2.3 m
|
2.1 m
|
Observations – did car travel smoothly,
straight, always forward, etc?
|
Went straight
|
Went straight
|
Went straight
|
Did lever / string operate smoothly?
|
Yes
|
Yes
|
Yes
|
3.3 Video Clips
Phy PT Test 1: http://youtu.be/hIJZdUDLi94
Phy PT Test 2: http://youtu.be/S-yqpPJlggE
Phy PT Test 3: http://youtu.be/_NwArgIxv-w
No comments:
Post a Comment