* Newton's Law of Universal Gravitation: This law states that every particle in the Universe attracts every other particle with a force that is:

* Proportional to the product of their masses: The more massive the objects, the stronger the gravitational attraction.

* Inversely proportional to the square of the distance between them: The further apart the objects, the weaker the force.

* Force of Gravity on Earth: Near the surface of the Earth, the force of gravity acting on an object is approximately equal to its weight. This weight is calculated by:

* Weight = Mass x Acceleration due to gravity (g)

* 'g' is approximately 9.8 m/s², a constant value on Earth.

In short: Gravity acts on mass, pulling it towards the center of the Earth (or another massive object). The more massive the object, the stronger the force of gravity acting on it.