The gravitational force is responsible for the motion of_:
Correct answer: D. Planet around the sun
- A. Atom round the nucleus
- B. Motor car on the road
- C. A body round the axes
- D. Planet around the sun
Explanation
The gravitational force Fg is responsible for the motion of planets around the Sun. According to Newton's law of universal gravitation, every mass in the universe attracts every other mass with a force directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. In the case of planets orbiting the Sun, this gravitational force provides the centripetal force needed to keep the planets in their orbits, following Kepler's laws of planetary motion.
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About Gravitation
Newton’s law of universal gravitation relates the force between masses to their masses and separation, while gravitational field strength explains weight and orbital motion. The topic covers satellite velocity and period, escape ideas, weightlessness in free fall, and artificial gravity, which differs from ordinary gravitational attraction.
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