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8.3 understand why gravitational field strength, g, varies and know that it is different on other planets and the Moon from that on the Earth
8.4 explain that gravitational force: • causes moons to orbit planets • causes the planets to orbit the Sun • causes artificial satellites to orbit the Earth • causes comets to orbit the Sun
8.5 describe the differences in the orbits of comets, moons and planets
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8.6 use the relationship between orbital speed, orbital radius and time period:
orbital speed = (2π x orbital radius) / time period