Explain, in terms of the properties of the four basic forces, why people notice the gravitational force acting on their bodies if it is such a comparatively weak force.

The four fundamental forces are listed below,

(1) Strong nuclear force.

(2) Weak nuclear force.

(3) Gravitational force

(4) Electromagnetic force.

Gravitational force is generally the force of gravity. These forces are attractive and dormant. It determines the motion of stars, galaxies, planets, and moons.

The relative strength of the gravitational force is of the order of ${}^{{10}^{-38}}$. The gravitational force being the weakest is still noticed because of its attractive nature. Gravitational force is acting on the entire Earth. The weight of a person is due to this gravitational force. In astronomical systems, it helps in determining the motion of planets, galaxies, stars, and moons.

Hence, the gravitational force is noticeable.