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 9
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.
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 would happen to a planet if the Sun's gravity suddenly disappeared.
If the distance between two planets is doubled, the gravitational force between them becomes: (1) Four times greater (2) Twice as great (3) One-fourth as great (4) Half as great
If the mass of the Sun were to double, what would happen to the gravitational force between the Sun and a planet? (1) It would double (2) It would halve (3) It would remain the same (4) It would become zero
Which of the following best describes the direction of a planet's velocity at any point in its orbit? (1) Toward the Sun (2) Away from the Sun (3) Tangent to the orbit (4) Perpendicular to the Sun
Which of the following best describes the shape of planetary orbits? (1) Circular (2) Elliptical (3) Parabolic (4) Hyperbolic
According to Kepler's Second Law, a line joining a planet and the Sun sweeps out equal ________ in equal times.
Fill in the blank: The farthest point in a planet's orbit from the Sun is called the ________.
Fill in the blank: The gravitational constant is denoted by the letter ________.
Fill in the blank: The imaginary line joining a planet and the Sun is called the ________.
True or False: All planets in our solar system revolve around the Sun in the same direction.
True or False: The closer a planet is to the Sun, the faster it moves in its orbit.
True or False: The gravitational force between the Sun and a planet is always attractive.
True or False: The gravitational force between two objects increases as the distance between them increases.
