Planetary Motion
Physics ⇒ Earth and Space Physics
Planetary Motion starts at 8 and continues till grade 12.
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See sample questions for grade 10
A planet has an orbital period of 8 years. According to Kepler's third law, what is the ratio of the cube of its average distance from the Sun to the square of its period?
A planet is 4 times farther from the Sun than Earth. According to Kepler's third law, how many times longer is its orbital period compared to Earth's?
A planet orbits the Sun at an average distance of 9 AU. What is its orbital period in years? (Use Kepler's third law: T² = a³)
A satellite orbits Earth at a height where the acceleration due to gravity is 5 m/s². If the mass of the satellite is 1000 kg, what is the gravitational force acting on it?
According to Kepler's second law, what does a line joining a planet and the Sun sweep out in equal times?
Describe the main difference between geocentric and heliocentric models of planetary motion.
Describe what is meant by the term 'orbital velocity'.
Explain why the planets do not move in straight lines but follow curved paths around the Sun.
If the mass of the Sun were to double, what would happen to the gravitational force between the Sun and a planet?
State Newton's law of universal gravitation.
Which law explains why the planets move faster when they are closer to the Sun and slower when they are farther away?
Which law states that every planet moves in an elliptical orbit with the Sun at one focus?
Which scientist formulated the three laws of planetary motion?
