Nicola_Suntrek_StarterActivityies_yr9.doc

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S T A R T E R   A C T I V I T I E S   –   Y E A R   9 1 Comparing mass and surface gravity Look at the information in the table: Planet Mass of planet (Earth = 1) Surface gravity (N/kg) Mercury 0.1 3.6 Venus 0.8 8.6 Earth 1.0 9.8 Mars 0.1 3.7 Jupiter 318 25.9 Saturn 95 ? a Which planet has the highest surface gravity? ................................................................................................................................. b Describe the pattern between the mass of the planet and the surface gravity. ................................................................................................................................. ................................................................................................................................. c Predict the value of surface gravity for Saturn. Explain why you have predicted  this value. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. .................................................................................................................................
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2 Comparing a satellite’s speed and distance from Earth Many satellites orbit the Earth. The speed at which they move depends upon their  distance from the Earth. Look at the information in the table: Distance from Earth (km) Speed (km/s) 1 000 7.3 4 000 6.2 7 000 5.5 10 000 4.9 a Describe the pattern that you can see between the distance from the Earth and the  speed of the satellite. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. b The European Space Agency put two new satellites into orbit around the Earth. A  monitoring satellite called MapSat was given an orbit height of 2000 km while a  telecommunications satellite called TelSat was placed at a height of 12000 km. Predict the speeds of the two satellites.     Speed of  MapSat =  .............................................................. ii    Speed of TelSat    =  ..............................................
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3 The force of gravity The force of gravity between two masses is affected by two variables: 1 It increases as the size of the masses increases. 2 It decreases as the distance between the masses increases. Sketch two graphs to show these relationships: a b
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4.  The speed of a rocket after launch Look at the graph. a . What does it tell us about how the rocket’s speed changes with time after launch?
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