9J Gravity and Space Year 9

1. An object’s weight: 1.is caused because it is pulled towards the Earth. 2.is caused by the Earth’s magnetic field. 3.is caused by the air pushing down on it. 4.stays the same, even if its mass changes

2. The direction ‘down’ is: 1.the same everywhere. 2.at right angles to the ground. 3.towards the centre of the Earth. 4.different under water

3. Which statement is not true? 1.The Earth attracts objects because it has a large mass. 2.You are attracting this Quiz paper with a small force of gravity. 3.Only large objects like the Earth produce a force of gravity. 4.Your body is attracting the Earth

4. A bag of sugar has a mass of 1 kg. What is its weight? 1.1N 2.10N 3.10 kg 4.0.1N

5. Gravity is less on the Moon than on the Earth because: 1.the Moon is smaller than the Earth. 2.the Moon has a bigger mass than the Earth. 3.the Moon is bigger than the Earth. 4.the Moon has less mass than the Earth

6. On Mars, the strength of gravity is 9 N/kg. If your mass is 50 kg, how much would you weigh on Mars? 1.450N 2.90N 3.50N 4.45N

7. Gravity: 1.gets less if two objects get closer together. 2.gets bigger if two objects get further apart. 3.gets less if two objects get further apart. 4.does not depend on distance

8. Which statement is true? 1.Gravity always pulls a spacecraft towards the nearest planet. 2.There is no gravity in space. 3.Gravity is the same at all times during a space journey. 4.Gravity depends on how close a spacecraft is to a planet

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9. There have been different ideas about the Solar System in the past. Which one of these was not suggested? 1.The Moon is at the centre with the planets orbiting around it. 2.The planets are fixed to solid spheres that move around the Earth. 3.The planets move in circles around the Earth. 4.The planets move in circles around the Sun

10. Ptolemy’s model of the Solar System had the Earth in the centre with the Sun and planets moving in circular orbits around it. Our modern idea about the Solar System is different because we think: 1.that Mars moves around the Earth. 2.the Sun is moving around the Earth. 3.the Earth moves around the Moon. 4.the Sun is at the centre of the Solar System

11. Which statement best describes our current ideas about the Solar System? 1.The planets all move in circular orbits around the Earth. 2.The planets all move in circular orbits around the Sun. 3.The planets all move in elliptical orbits around the Sun. 4.The planets all move in elliptical orbits around the Earth

12. Why do we believe our current model of the Solar System? 1.We can see the elliptical orbits. 2.It can accurately predict the movements of the planets. 3.It agrees with religious ideas. 4.We have sent people to visit the Moon

13. The planets stay in their orbits around the Sun because of: 1.the gravity pull from the Moon. 2.the gravity pull from the Sun. 3.magnetism. 4.the gravity pull from the Earth

14. A satellite is: 1.anything that orbits a planet. 2.anything that orbits the Sun. 3.something man-made that orbits the Earth. 4.a machine that sends TV programmes

15. Artificial satellites can be used for: 1.sending telephone calls. 2.taking photos of the stars and other galaxies. 3.helping people to find where they are on the Earth. 4.all of the above

16. A TV satellite would be put into: 1.a geostationary orbit, so it covers all parts of the Earth. 2.a polar orbit, so it covers all parts of the Earth. 3.a geostationary orbit, so it stays above the same place on the Earth. 4.a polar orbit, so it stays above the same place on the Earth