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 9
A planet is observed to move faster when it is closer to the Sun and slower when it is farther away. Which law explains this observation?
A planet is twice as far from the Sun as Earth. According to Kepler's Third Law, how many Earth years does it take to complete one orbit?
A planet orbits the Sun at a distance of 1 AU. What is its orbital period in Earth years?
Describe what is meant by the term 'orbital eccentricity'.
Describe what would happen to a planet if the Sun's gravity suddenly disappeared.
Explain why satellites (including moons) stay in orbit around planets.
Explain why the Moon does not fall to Earth despite the force of gravity acting on it.
Explain why the orbital speed of a planet changes as it moves around the Sun.
If a planet's orbital period is 8 years, what is the cube of the ratio of its semi-major axis to Earth's semi-major axis?
Name the force that keeps planets in orbit around the Sun.
State Kepler's Third Law of Planetary Motion.
State Newton's Law of Universal Gravitation.
What is the main reason for the seasons on Earth?
Which law states that planets move in elliptical orbits with the Sun at one focus?
