Crossword Puzzle

3. The force that attracts objects towards each other, especially the force that pulls objects towards the Earth.
7. A strong, lightweight material consisting of very thin fibres of carbon, commonly used to make composite materials for aircraft and vehicles.
8. To apply force to move something away from yourself or in a particular direction.
9. To apply force to move something towards yourself or in a particular direction.
10. To keep a machine, system or equipment in good working condition by checking and repairing it regularly.
12. To turn or cause something to turn quickly around a central point or axis.
14. A device worn on the back that uses jets of gas or another propulsion system to lift a person into the air.
16. Travelling at a speed greater than the speed of sound.
18. To move slowly away from a position or intended direction, especially because of wind or water currents.
19. A single force that has the same effect as all the forces acting on an object combined.
20. The main body of an aircraft that contains the crew, passengers or cargo and connects the wings and tail.

1. A type of airship without a rigid internal frame that uses a gas lighter than air to stay in the air.
2. The amount of force applied to a surface per unit area.
4. Having a complex design or using advanced technology to perform difficult tasks effectively.
5. To resist force, pressure, heat or other difficult conditions without being damaged or destroyed.
6. A force that opposes the movement of an object through air or another fluid.
11. A force produced by an engine or propulsion system that pushes an aircraft or rocket forwards.
13. The maximum distance an aircraft or vehicle can travel without refuelling or recharging.
15. To remain in approximately the same position in the air without moving in any particular direction.
17. An aircraft without an engine that flies by gliding through the air and can use rising air currents to stay in the air longer.