Define gravitational force. Give its examples.

1.	Define gravitational force. Give its examples.
Answer» Force of attraction between two (point) masses separated by a distance is called as gravitational force. F = \(G\frac{m_1m_2}{r^2}\) where ‘G’ is constant called the universal gravitational constant = 6.67 × 10^-11 Nm²/kg² Examples: 1. The motion of moon, artificial satellites around the earth and motion of planets around the sun is due to gravitational force of attraction. 2. The concept of weight of a body in the earth’s gravitational field is due to gravitational force exerted by the earth on a body.

Answer»

Force of attraction between two (point) masses separated by a distance is called as gravitational force.

F = \(G\frac{m_1m_2}{r^2}\)

where ‘G’ is constant called the universal gravitational constant = 6.67 × 10^-11 Nm²/kg²

Examples:

1. The motion of moon, artificial satellites around the earth and motion of planets around the sun is due to gravitational force of attraction.

2. The concept of weight of a body in the earth’s gravitational field is due to gravitational force exerted by the earth on a body.

Discussion