Planetary Motion
Physics ⇒ Earth and Space Physics
Planetary Motion starts at 8 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Planetary Motion.
How you perform is determined by your score and the time you take.
When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 8
A planet is twice as far from the Sun as Earth. According to Kepler’s Third Law, will its orbital period be more or less than twice as long as Earth’s?
A planet orbits the Sun at a distance of 1 AU. According to Kepler’s Third Law, what is its orbital period?
Describe the difference between rotation and revolution in planetary motion.
Describe what is meant by ‘orbital eccentricity’.
Describe what is meant by a ‘year’ on a planet.
Explain why planets do not fall into the Sun despite the Sun’s strong gravity.
Explain why the same side of the Moon always faces the Earth.
If a planet’s orbital period is 8 years and its average distance from the Sun is 4 astronomical units (AU), does this follow Kepler’s Third Law? (Hint: Kepler’s Third Law: T² = r³, where T is period in years, r is distance in AU)
State Newton’s Law of Universal Gravitation.
What is the main reason for the seasons on Earth?
What is the name of the point in a planet’s orbit that is closest to the Sun?
What is the term for the time it takes a planet to complete one full orbit around the Sun?
Which force is primarily responsible for keeping planets in orbit around the Sun?
Who formulated the three laws of planetary motion?
