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| helicopter.doc |
Exercise 1: Going airborne 1. When the helicopter is moving at a constant velocity, is there a net force acting on it?
No 2. The helicopter first moves up, and then you caused it to hover (or attempted to cause it to hover). Did there have to be a negative net force acting on the craft at some point for this to occur? Why?
No. There must be a negative force acting on it to slow the helicopter down but the net force does not need to be negative at any point. Exercise 2: What is the mass of the helicopter?
Force
Acceleration
Data point 1
2000 N
.98
Data point 2
5000 N
2.45
3. Does the acceleration change with the net force? What is the mathematical relationship of acceleration and net force?
As the net force increases the acceleration also increases. 4. What is the mass of the helicopter? How did you determine it?
2040.81 I took the force of the helicoptor then divided by the acceleration. Exercise 3: Net force and acceleration 5. What lift force was required to save the day?
32000 Exercise 4: Air resistance
Speed
Force
Data point 1
11.2 m/s
1000 N
Data point 2
25.10 m/s
5000 N
Data point 3
5.5 m/s
250 N
Data point 4
15.86 m/s
2000 N
6. Look at your data. How does the force of air resistance vary with the speed of the helicopter? Does the force of air resistance increase as helicopter speed increases, decrease as helicopter speed increases, stay the same, or is there no relationship at all? Use your data to justify your answer.
Air resistance increases as the force increases and decreases as the helicopter speed decreases. 7. Using the guidelines above, is the relationship between air resistance force and helicopter speed a linear, inverse, or squared relationship? Or is there no relationship at all? Justify your answer using your data.
Inverse because as one increases the other must increase. Exercise 5: Flying your helicopter 8. What horizontal thrust force is required for the helicopter to have zero horizontal velocity? To be moving at a constant horizontal velocity?
Zero Exercise 6 (optional): Save the day! 9. What is the required lift force? Given this lift force, what are the net horizontal and vertical forces?
25500. Horizontal is 4428 and vertical is 25112.
No 2. The helicopter first moves up, and then you caused it to hover (or attempted to cause it to hover). Did there have to be a negative net force acting on the craft at some point for this to occur? Why?
No. There must be a negative force acting on it to slow the helicopter down but the net force does not need to be negative at any point. Exercise 2: What is the mass of the helicopter?
Force
Acceleration
Data point 1
2000 N
.98
Data point 2
5000 N
2.45
3. Does the acceleration change with the net force? What is the mathematical relationship of acceleration and net force?
As the net force increases the acceleration also increases. 4. What is the mass of the helicopter? How did you determine it?
2040.81 I took the force of the helicoptor then divided by the acceleration. Exercise 3: Net force and acceleration 5. What lift force was required to save the day?
32000 Exercise 4: Air resistance
Speed
Force
Data point 1
11.2 m/s
1000 N
Data point 2
25.10 m/s
5000 N
Data point 3
5.5 m/s
250 N
Data point 4
15.86 m/s
2000 N
6. Look at your data. How does the force of air resistance vary with the speed of the helicopter? Does the force of air resistance increase as helicopter speed increases, decrease as helicopter speed increases, stay the same, or is there no relationship at all? Use your data to justify your answer.
Air resistance increases as the force increases and decreases as the helicopter speed decreases. 7. Using the guidelines above, is the relationship between air resistance force and helicopter speed a linear, inverse, or squared relationship? Or is there no relationship at all? Justify your answer using your data.
Inverse because as one increases the other must increase. Exercise 5: Flying your helicopter 8. What horizontal thrust force is required for the helicopter to have zero horizontal velocity? To be moving at a constant horizontal velocity?
Zero Exercise 6 (optional): Save the day! 9. What is the required lift force? Given this lift force, what are the net horizontal and vertical forces?
25500. Horizontal is 4428 and vertical is 25112.
