Coefficient of aerodynamic test
With
the help of a wind tunnel, one can obtain an estimate of the friction
coefficient of the air. As this is an introduction, the coefficient is
of the form:
Fa = cv2
Protocol
1. Place the vehicle on the plate within the tube.
2. Attaching the rope to the front of the vehicle
3. Record the mass of the vehicle on the scale
4. Record the mass of the weight on the scale test
5. Place the cursor at first position for the blower.
6. Wait until the masses become stable
7. Note the masses of the two scales
8. Repeat steps 5-7 with the other positions the cursor to the blower
where
Calculating the force of air resistance
Fa
= (ballast mass – ballast mass(position zero))*9, 8
|
Position cursor |
Air speed (m/s) v |
Vehicle mass (kg) |
Ballast mass (kg) |
Force res air Fa |
v2 |
C = Fa/v2 |
|
0 |
|
|
|
|
|
|
|
1 |
|
|
|
|
|
|
|
2 |
|
|
|
|
|
|
|
3 |
|
|
|
|
|
|
|
4 |
|
|
|
|
|
|
|
5 |
|
|
|
|
|
|
|
6 |
|
|
|
|
|
|
|
Average of C |
|
|||||
|
|
||||||
| Robin
St-Pierre Enseignant de science et technologie |
|
Robin
St-Pierre Science and technology teacher |
||||
| École secondaire des Patriotes-de-Beauharnois |
|
École secondaire des Patriotes-de-Beauharnois | ||||
| Commission scolaire de la Vallée-des-Tisserands |
|
Commission scolaire de la Vallée-des-Tisserands | ||||
| Courriel : | 
|
personnel |
|
E-mail : |
|
personnal |
|
|
|
travail |
|
|
|
@school |