Question

Which force is responsible for the stability of our universe?

Answer 1

The only force that acts between heavenly bodies in the solar system and the whole universe is the gravitational force.Gravity is a force by which planets and other heavenly bodies present in the universe draws objects towards its centre. It is an invisible force that pulls objects toward each other.

Complete answer:
Objects having higher mass have more gravity than lighter objects. Gravitational force decreases with increase in distance. In our solar system this gravitational force holds the planets in different orbits which revolve around the sun. The moon revolves around earth in a particular orbit and the gravitational pull of the moon pulls the seas towards it which causes high and low tides.

On Earth the force of gravity helps us to remain on ground. Whenever we jump, we land on the ground due to gravitational pull towards the centre of earth. Gravity is not the same everywhere on earth. It is slightly stronger near the poles than at the equator. This is because the earth is not perfectly spherical in shape. It is somewhat elliptical in shape due to which some centrifugal forces are produced due to earth’s rotation.

The acceleration due to gravity on earth’s surface is nearly about $9.81\,m{{s}^{-2}}$.Gravitational force is always attractive in nature and does not depend on the intervening medium. The formula to calculate gravitational force is
$F=\dfrac{GMm}{{{R}^{2}}}$
Where $G$ is known as universal gravitational constant and $M$ is mass of the first body and $m$ is mass of the second body and $R$ is distance between the centre of the two bodies.

Note: Gravitational force depends on two factors: mass of the bodies and distance between the bodies. It is directly proportional to mass of the body and inversely proportional to square of distance between the bodies.