Structures and Mechanisms Flight

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1. Which of the following is a flight-related application of the properties of air?

• a) Breathing
• b) Swimming
• c) Driving
• d) Sailing

2. What are the four forces of flight?

• a) Up, down, left, right
• b) Lift, weight, thrust, drag
• c) Push, pull, spin, stop
• d) Glide, spin, drop, float

3. Which force opposes thrust in flight?

• a) Lift
• b) Weight
• c) Drag
• d) Momentum

4. What force keeps an aircraft aloft?

• a) Weight
• b) Drag
• c) Lift
• d) Thrust

5. Birds and airplanes both use which force to stay in the air?

• a) Weight
• b) Drag
• c) Lift
• d) Thrust

6. When lift and weight are balanced, what can occur?

• a) Stall
• b) Climb or descend
• c) Hover in place
• d) Rapid acceleration

7. What force opposes thrust and slows down an aircraft?

• a) Weight
• b) Drag
• c) Lift
• d) Gravity

8. Which of these forces is necessary for an aircraft to move forward?

• a) Lift
• b) Weight
• c) Thrust
• d) Drag

9. The force that opposes lift in flight is:

• a) Thrust
• b) Drag
• c) Gravity
• d) Pressure