Which of the following is the evidence to show that there must be force acting on Earth and directed towards the Sun?
Correct answer: B. Revolution of the Earth round the Sun
- A. Deviation of the falling bodies towards east
- B. Revolution of the Earth round the Sun
- C. Phenomenon of day and night
- D. Apparent motion of Sun round the Earth
Explanation
Option B is a key piece of evidence. The fact that Earth revolves around the Sun is a result of gravitational attraction between the Earth and the Sun. According to Kepler's laws of planetary motion and Newton's law of universal gravitation, there must be a force acting on Earth directed towards the Sun to keep it in orbit.
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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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