Across
- 5. a measure of height above ground level
- 7. Sir Isaac Newton's 3 Laws of __________
- 8. the brothers who invented the airplane
- 9. the body of the plane
- 10. the brothers who invented the hot air balloon
- 12. the force that acts against thrust
Down
- 1. the study of how air moves around things
- 2. the action or process of flying through the air
- 3. a force that acts against weight caused by air moving over and under the wings
- 4. the only mammal that can fly
- 6. the tail unit of the plane
- 11. air is mostly nitrogen and ___________