The force of attraction between two objects of masses 'M' and 'm' which lie at a distance 'd' from each other is directly proportional to the-

CONCEPT:

• Gravity (or gravitation): The universal force of attraction acting between all matters.
  • It is the weakest known force in nature.
• The Law of Universal Gravitation states that every mass attracts every other mass in the universe by a force acting on a straight line between the centers-of-mass of both points.
  • The force is proportional to the product of the masses of the objects and inversely proportional to the square of the distance between them.

\(F = G\frac{{Mm}}{{{r^2}}}\)

Where G is universal gravitational constant, M and m are masses and r is the distance between two masses.

• The Law applies to all objects with masses, big or small.

EXPLANATION:

• The force of attraction between two objects of masses M and m which lie at a distance d from each other is directly proportional to the Product of the masses of objects M x m. So option 2 is correct.