Across
- 3. For every force acting on one object, there is an equal but opposite force acting on a different object (also called action and reaction forces).
- 6. The action of pulling something forcefully or with difficulty.
- 7. A vehicle or missile that produces thrust in one direction by ejecting high-speed gases in the opposite direction. Rockets carry all of their own propellant.
- 11. Force = mass x acceleration (also stated as acceleration = force divided by mass). An object accelerates more quickly if there is a greater force pushing it. Also, it is harder to accelerate an object if it has more mass (kilograms).
- 13. Water or air contains strong currents which change direction suddenly.
- 15. An American engineer, professor, physicist, and inventor who is credited with creating and building the world's first liquid-fueled rocket.
- 16. Means takeoff, especially the vertical takeoff of a rocket or helicopter.
- 17. The reaction force that pushes a rocket in one direction as propellant is pushed in the opposite direction.
Down
- 1. The material that is used to create a pressurised gas that creates thrust when released. For a chemical rocket, the propellant is the fuel and oxidiser.
- 2. Uninterrupted flow in a fluid near a solid boundary in which the direction of flow at every point remains constant.
- 4. An object will remain at rest or keep moving at a constant speed in a straight line unless there is an unbalanced force.
- 5. A small rocket engine on a spacecraft, used to make alterations in its flight path or altitude.
- 8. The average location of the weight of an object.
- 9. A German aerospace engineer and space architect and champions of space exploration in the twentieth century.
- 10. Is the point where the total sum of a pressure field acts on a body, causing a force to act through that point.
- 12. Is the rate of motion in a specific direction.
- 14. A measure of the maximum momentum that a given reaction engine and fuel supply can impart to a vehicle.