1. Ch. 9 Project: Modeling Aircraft Motion
Kaylen Cruse
4/17/13
2nd Blk.

2. Q’s 1-4 & Answers
1 . What will happen to the aircraft if the lift is held constant while the weight is decreased (say from burning off fuel)?
The airplane will lift higher, go upwards, lift increase
2. What will happen to the aircraft if the lift is decreased while the weight is held constant?
Lift decrease, go downward/lower
3. What will happen to the aircraft if the thrust is increased while the drag is held constant?
Fly faster
4. What will happen to the aircraft if the drag is increased while the thrust is held constant?
Fly slower

3. Q’s 5-7& Answers
5. If 1 kg = lb, convert the weight of the Wright brothers’ plane kilograms.
2.205 lb. = 700 lb lb. = lb.(w) w= 700 lb./2.205 lb. w=
1 kg w
w= about kg
6. If acceleration due to gravity is a= 9.80 m/sec², determine the force due to weight on the Wright brothers’ plane.
F=ma
F=317.5 kg (9.80 m/s²)
F= N
7. What must be true about the lift force of the Wright brothers’ plane for it to get off the ground?
The lift force has to be or higher for the plane to lift off the ground.

4. Q. 8 & Answer
8. The weight of a fully loaded Cessna 170B is 2200 lb. What lift force is required to get this plane off the ground?
2.205 lb./ 1 kg = 2200 lb./ w
 2200 lb. = lb. (w)
w= 2200 lb. / lb.
w= kg
w= about kg
F= ma, F= kg (9.80 m/s²), F= N, F= about N

5. Q. 9 & Answer
9. The maximum gross weight of a Boeing 747 is 255,000 lb. What lift force is required to get this jet off the ground?
2.205 lb. / 1 kg. = 255,000 lb./ w
255,000 lb. = lb. (w)
w= 255,000 lb. / lb.
w= kg
w= about kg
F=ma, F= kg (9.80 m/s²), F=1,133, N, F= about 1,133,333.3 N

6. The End