Gravity and the Universe 1.0 / 5 based on 1 rating ? PhysicsForces and MotionIGCSEEdexcel Created by: joydadaCreated on: 12-04-17 12:15 What is a galaxy? A large collection of stars 1 of 18 Where is our Solar System? In a galaxy called the Milky Way 2 of 18 What is gravity's role in the universe? To keep the stars together and in orbit 3 of 18 What is a universe? A large collection of billions of galaxies 4 of 18 What is an orbit? A balance between the forward motion of an object and a force pulling in it inwards 5 of 18 What type of orbit do planets and moons have? Almost circular but slightly eliptical 6 of 18 What is a satellite? An object that orbits a larger object 7 of 18 What is a natural satellite? The moon 8 of 18 What is an artificial satellite? The International Space Station 9 of 18 What are comets? Small lumps of icy rock that orbit the Sun 10 of 18 What effects the size of gravity that an object can emit? Its mass 11 of 18 What effects the size of gravity an object experiences? Its distance to a star or planet 12 of 18 What orbit does a comet have? Very Eliptical 13 of 18 What orbital period do comets usually have? Longer than earth because they travel to the outer edges of the solar system 14 of 18 When is a comet moving its fastest? When it is close to the Sun because the increased gravitational pull makes it speed up 15 of 18 What are geostationary satellites and what are they used for? Artificial Satellites that have an orbital period of 1 day and are used in Communications 16 of 18 How do you find the orbital speed of a circular orbit? 2 x π x orbital radius/time period 17 of 18 What is the unit of orbital speed? km/s 18 of 18
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