1. Rockets and Satellites

2. How Do Rockets Lift Off? Rockets and space shuttles lift into space using Newton’s third law of motion.

3. How Do Rockets Lift Off? They burn fuel and push the exhaust gases downward at a high velocity as they lift off. In turn, the gases push upward on the rocket.

5. How Do Rockets Lift Off? A rocket can rise into the air because the gases it expels with a downward action force exert an equal but opposite reaction force on the rocket.

6. How Do Rockets Lift Off? As long as this upward force, called thrust, is greater than the downward pull of gravity, there is an unbalanced force in the upward direction that causes a change in the rocket’s velocity. As a result, the rocket accelerates upward into space.

7. What is a Satellite? Satellite is any object that orbits another object in space. – Moon – Artificial satellite

8. What is a Satellite?

9. Circular Motion Artificial satellites travel around Earth in an almost circular path.

10. Circular Motion An object traveling in a circle is constantly changing direction, so it is accelerating. If an object is accelerating, an unbalanced force must be acting on it.

11. Circular Motion Centripetal Force is any force that causes an object to move in a circular path. – Center seeking – Acts in perpendicular to the direction the object is moving

12. Satellite Motion Satellites in orbit around Earth continuously fall toward Earth, but because Earth is curved they travel around it. The speed with which an object must be thrown in order to orbit Earth is 7,900 m/s.

13. Satellite Location Some in low orbits – Mapping – Observation Around the Earth in a couple of hours

14. Satellite Location Others in higher orbits travel more slowly  Communications  36,000 km above Earth’s surface

15. Satellite Location