4 pop tops | 4 index cards | 2 skewers |
2 straws | 2 straws | tape |
hot glue |
Design Decision |
Rationale |
4 Wheels |
More Stable |
8” x 2.5” |
Longer body should go straighter |
Weight holder above rear axle |
Ease transition between ramp and floor by allowing front to pivot on back axle |
Encase holder in wedge shape |
Better aerodynamics, use back for motion detector |
¼” rail assembly |
More rigid, durable construction |
Overlap center joint by 1” |
Stronger joint |
Design Problem |
Resolution |
Loss of masses on transition from ramp to floor |
Add support under mass holder |
Bending of frame during transition from ramp to floor |
Add rail along length of car, additional rail across middle for more support |
Car turns to right |
Adjust wheel/axle to make car go straight |
Trial # | Variables | Graph | Slope/ Velocity |
Conclusion |
1 | Mass:10g Angle:45 |
.5 m/s | Test larger angle | |
2 | Mass:10g Angle:60 |
.2 m/s | Test smaller angle | |
3 | Mass:10g Angle:55 |
.3 m/s | Test smaller angle | |
4 | Mass:10g Angle:35 |
.6 m/s | Test slightly larger angle | |
5 | Mass:10g Angle:40 |
.8 m/s | Test slightly smaller angle | |
6 | Mass:10g Angle:37 |
1.0 m/s | Optimum angle =37 Test mass | |
7 | Mass:20g Angle:37 |
1.5 m/s | Test larger mass | |
8 | Mass:30g Angle:37 |
1.7 m/s | Test slightly smaller mass | |
9 | Mass:25g Angle:37 |
1.9 m/s | Test slightly smaller mass | |
10 | Mass:22g Angle:37 |
2 m/s | Optimum mass = 22g |
Using 22g and an angle of 37 degrees, the car should reach an average velocity of 2 m\s during its run.
In addtion to the above, students should also have: