3.1 Trial Test and Design Modification
MODIFICATION (New Google-sketchup)
3.2 Test Data
2. Data tables showing the results of all 3 trials.
Run Number
|
Run 1
|
Run 2
|
Run 3
|
Total Time of Run
|
0
|
05:48
|
05:03
|
Total Distance
|
0m
| 5.4m |
5.4m
|
Time for Lever to fully release
|
NIL
|
05:48
|
05:03
|
Distance Car Travel while lever is releasing
|
0m
| 5.3m |
5.3m
|
Observation
|
The car did not move.
|
Car travelled a little faster but still not very fast
|
Car travelled a little faster but can be further improved
|
Lever Operation
|
The lever did not move
|
Snapped but lesser
|
Did not snap
|
File Name for Video
| |||
Area for Improvement
|
The rod that we used was a square rod.
|
The string was not long enough
|
The wheels had a lot of friction
|
Possible reason
|
This is because, the square rod has edges. Hence, when the string is pulled to be uncoiled and move the wheels, the flat edges of the square rod is pulled and pressed against surface of the axle whole, hence preventing the axle from turning.
|
Due to the length of the string being too short, the force applied by the mousetrap was not maximised, causing the wheel to spin for a lesser time which decreases total distance travelled.
|
The friction between the axle and the axle holders were too high
|
Modification Made
|
We changed the square rod into a circular one.
|
We increased the length of the string used.
|
We greased the axle holes.
|
MODIFICATION (New Google-sketchup)
1. All relevant measurements of car (after modification).
Mass of your car
|
200g
|
Mass of each wheel (or one of they are all the same)
|
15.0g
|
Wheel diameter
|
11.8cm
|
Axle diameter
|
0.60cm
|
Length of string (power stroke)
|
33.0cm
|
Approx. number of wraps of string
|
7.00
|
Length of lever extension
|
11.0cm
|
Overall length
| 33.0cm |
Overall width
|
11.8cm
|
Overall height
|
15.3cm
|
2. Data tables showing the results of all 3 trials.
Run Number
|
Run 1
|
Run 2
|
Run 3
|
Total Time of Run
|
09:03
|
08:61
|
10:33
|
Total Distance
|
5.55m
|
5.78m
|
5.48m
|
Time for Lever to fully release
|
08:46
|
07:67
|
09:55
|
Distance Car Travel while lever is releasing
|
5.45m
|
5.68m
|
5.38m
|
Observation
|
The mousetrap gradually released.
|
The mousetrap gradually released.
|
The mousetrap gradually released.
|
Lever Operation
| The lever released in a smooth fashion |
The lever released in a relatively smooth fashion
|
The lever released very smoothly
|
File Name for Video
Competition Rules Student teams will design and build their own vehicle which must be solely powered by a standard mousetrap. Competition rules are as follows: 1. The standard mousetrap must be mounted to the chassis and must not be painted or decorated 2. The springs on the mousetrap may not be cut, bent, over- wound, heat-treated or altered in any other manner. No additional source of elastic potential energy can be incorporated into the engine/drivetrain mechanism. 3. Additional inputs of energy are not allowed as part of the official competition. 4. Teams may supply some of their own materials and are encouraged to use recycled, re-purposed materials. Kits are not allowed. 5. Distance traveled will be measured from the front axle to the point where the front axle stops or leaves the designated track area. Distance will be measured as a straight line path. 6. Vehicles must have 3 or 4 wheels. All wheel materials and designs are permitted. 7. Students are permitted to design the chassis of their choice. 8. Engineering modifications such as gearing, lubricants, bushings and bearings are permitted. 9. Testing will consist of three runs and the best score will count. MTV design cannot be altered between these runs. Minor adjustments are permitted with the instructor’s permission and must be documented. SCORING Teams must decide to focus on distance, acceleration or an optimized combination of both. Scoring for the actual construction and testing of the mousetrap will be as follows: Total Score = 100 – 10p + 2d – 2t Base score 100 pts Number of rule violations p (min: 0 pts) Each 0.5 meters travelled (up to 8 meters) d (max: 16 pts) Seconds travelled (at least 1 second) t (min: 1 pts) A score of 130 is considered 100% for this part of the project. | LINK |
No comments:
Post a Comment