Section 5 – pg 402 Rockets and Satellites

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Presentation transcript:

Section 5 – pg 402 Rockets and Satellites Chapter 10 Section 5 – pg 402 Rockets and Satellites

Pg 403 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 Thrust: the upward force

What is a Satellite? Rockets are used to carry satellites into space Pg 403 What is a Satellite? Rockets are used to carry satellites into space Satellite: any object that orbits another object in space The moon is a satellite that orbits earth Artificial satellites are designed for communications, military intelligence, weather analysis, and geographical survey

Pg 403 Circular Motion An object traveling in a circle is constantly changing direction so it is accelerating Centripetal force: any force that causes an object to move in a circular path Centripetal means “center seeking”

Pg 404 Satellite Motion Satellites orbit around Earth continuously fall towards Earth, but because Earth is curved they travel around it A satellite does not need fuel because it continues to move ahead due to inertia An object orbiting earth must be traveling at about 7,900 m/s or 17,670 mph

Pg 405 Satellite Location How far up a satellite is effects how long it takes to orbit the earth An object orbiting the Earth less than 1,000 km up can orbit the Earth in under 2 hours An object orbiting the Earth about 36,000 km up takes 24 hours to orbit and would then always stay above the same spot of the Earth

Chapter 10 Section 5 Homework - Pg 405

1A. Which of Newton’s three laws of motion explain how a rocket lifts off?

1B. How do action-reaction pairs explain how a rocket lifts off?

1C. As a rocket travels upward from Earth, air resistance decreases along with the force of gravity. The rocket’s mass also decreases as fuel is used up. If thrust remains the same, how do these factors affect the rocket’s acceleration?

2A. What is a satellite?

2B. What causes satellites to stay in orbit rather than falling towards Earth?

2C. In Figure 22, a projectile is thrown with enough velocity to orbit Earth. What would happen if the projectile were thrown with greater velocity?