There are many forces in the world, plenty of pushes and pulls. One still pushes or pulls something, only the field.There are only four fundamentalforces in physics from which all new phenomena are derived: gravitational force, electromagnetic force, strong force and weak force.
Newton’s law of gravity states that the gravitational force among two bodies is proportionate to their masses and inversely related to the square of the distance among them. All bodies, counting you, are tugging on every other body in the whole universe! This phenomenon is termed as Newton’s Universal Law of Gravitation.
The universal law of gravitation states that:
Everybody in the universe pulls every other body with a force that is directly proportional to their mass-producedand inversely proportional to the distance square between them.
G is universal gravitational constant,
m1 and m2 are mass of bodies
r is the radius between the two masses
Example 1: Calculate the gravitational force if the mass of the sun is 1.99 × 1030 kg and earth is 5.97 × 1024 kg separated by the distance 1.5 × 1011 m?(Gravitational constant G = 6.673 × 10-11 Nm2/Kg2)