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?
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.
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?
If the distance between two planets is doubled, the gravitational force between them becomes (1) four times greater (2) twice as great (3) half as great (4) one-fourth as great
Which of the following best describes the shape of planetary orbits according to Kepler? (1) Circular (2) Elliptical (3) Parabolic (4) Hyperbolic
Which of the following best explains why planets do not fall into the Sun? (1) Their speed balances the pull of gravity (2) The Sun repels them (3) They are too far away (4) They are held by magnetic forces
Which of the following is NOT a part of Kepler's laws of planetary motion? (1) Law of Ellipses (2) Law of Equal Areas (3) Law of Universal Gravitation (4) Law of Periods
Fill in the blank: The constant G in Newton's law of universal gravitation is called the ________ gravitational constant.
Fill in the blank: The farthest point from the Sun in a planet's orbit is called ________.
Fill in the blank: The path of a planet around the Sun is called its ________.
Fill in the blank: The point in a planet's orbit closest to the Sun is called ________.
True or False: All planets in the solar system orbit 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 two objects depends only on their masses.
True or False: The mass of a planet affects its orbital period around the Sun.
