Newton's Law of Gravitation provided a unifying explanation for various phenomena in the universe.

Gravitation Law: Proving Universal Force

The core insight of the Law of Gravitation, developed by Isaac Newton, is its universality. It demonstrated that the force attracting objects towards the Earth (like a falling apple) is fundamentally the same force that dictates the orbital paths of the Moon around the Earth and the planets around the Sun.

Key Contribution of Gravitation Law

• Unification of Forces: It proved that terrestrial (Earth-based) and celestial (heavenly body) mechanics are governed by the same physical laws.
• Universal Nature: The gravitational force acts between any two objects with mass, regardless of their location in the universe.

Analysis of Options

• Option 1 (The Earth is flat): This was a misconception largely disproven before Newton's time and not the focus of his law of gravitation.
• Option 2 (The same force governs objects falling on Earth and the motion of planets): This is the central conclusion derived from Newton's Law of Gravitation, unifying observations of falling objects with astronomical data.
• Option 3 (The Sun revolves around the Earth): This represents the geocentric model, which was being challenged and eventually replaced by the heliocentric model (supported by Newton's laws).
• Option 4 (Gravity acts only on objects on Earth): This contradicts the universality principle established by Newton's law, which applies to celestial bodies as well.
• Option 5: This option is incomplete.

Therefore, the Law of Gravitation's most significant proof was establishing the existence of a single, universal force governing both earthly and celestial motion.