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Orbits of Planets and Moons

Orbits of Planets and Moons. Orbits. Universal Law of Gravitation. 9J Gravity and space. Orbits. 9J Gravity and space. Orbits All of the planets in our solar system revolve around the sun. The moon revolves around the Earth. Two forces keep the planets in orbit:

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Orbits of Planets and Moons

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  1. Orbits of Planets and Moons Orbits Universal Law of Gravitation

  2. 9J Gravity and space Orbits

  3. 9J Gravity and space • Orbits • All of the planets in our solar system revolve around the sun. • The moon revolves around the Earth. • Two forces keep the planets in orbit: • a. Inertia – Keeps the planet in a path moving away from the sun • Gravity keeps the planet moving towards the sun. • A balance of these 2 forces keep the planet moving towards the sun.

  4. 9J Keeping your feet on the ground gravity Wherever you are on Earth, the same force keeps your feet on the ground. It holds our atmosphere around us and keeps the oceans on the Earth. What is it? You remember – it’s...

  5. 9J Keeping your feet on the ground Universal Law of Gravitation All Objects in the universe are attracted to all other objects 1. The size of the planet and its speed determines the size of the planet’s orbit. 2. Planets closer to the sun have smaller, faster orbital paths. 3. Planets farther away from the sun have longer, slower orbital paths.

  6. 9J Working outwards from the Sun Earth Jupiter Saturn Neptune Uranus Mars Venus Label the planets in order, starting with Mercury nearest the Sun. Mercury Sun Distances not to scale

  7. 9J Satellite links So the Moon is a satellite of the Earth. What’s a satellite? There are also pieces of broken spaceship and other debris in orbit, that have been trapped by the Earth’s gravitational field. Anything that’s in orbit around a larger body. Scientists put artificial satellites in orbit round the Earth too.

  8. 9J Quiz How much do you know about our Universe? 1. The Moon orbits the Earth in… a)a circle b) an ellipse c)a spaceship. Correct Answer: B 2.Jupiter’s gravitational pull is… a)larger than Earth’s b) smaller than Earth’s c)the same as Earth’s. Correct Answer: A (It is about 2.5 times that of Earth’s Gravity)

  9. 9J Quiz 3. The Sun is at the centre of the… a)Earth b) Universe c)Solar System Correct Answer: C 4.The stars and planets stay in their places because of… a)glue b) gravity c)speed. Correct Answer: B

  10. 9J Space words word meaning the path a satellite takes around a body a ‘flattened circle’ shape force that pulls two bodies towards each other Anything in orbit around a larger body to do with the Moon to do with the Sun Match each word to its correct meaning. gravity solar orbit lunar ellipse satellite orbit ellipse gravity satellite lunar solar

  11. 9J Let’s stay together Why do planets orbit the Sun? It’s the result of gravity.What will happen if you switch the gravity off? Explain how gravity keeps the planet orbiting the Sun.

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