Question

The universal law of gravitation was propounded by
1. Kepler
2. Galileo
3. Newton
4. Copernicus

Answer 1

Correct Answer - Option 3 : Newton

The correct answer is Newton.

• The universal law of gravitation was propounded by Sir Isaac Newton.
• Newton used the universal law of gravity to prove that the moon is accelerating towards Earth just as a body on Earth is falling towards Earth.
• According to the Universal law of gravitation, the force between two bodies is directly proportional to their masses and inversely proportional to a square of the distance.
• The law was given in the year 1687.

Law	Statement
Kepler's laws of planetary motion	The orbit of a planet is an ellipse with the Sun at one of the two foci. A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time. The square of a planet's orbital period is proportional to the cube of the length of the semi-major axis of its orbit.
Galileo's Law of Inertia	It states that - "if no net force acts on an object, the object maintains in the same state of motion".
Copernicus Theory	He proposed that the Sun is the centre of the solar system and that the planets circle the Sun.