* Gravity is a force of attraction between objects with mass. It's one of the four fundamental forces in the universe, alongside electromagnetism, the strong nuclear force, and the weak nuclear force.
* Forces can be categorized as either contact or non-contact forces.
* Contact forces require direct physical contact between objects. Examples include friction, normal force, tension, and air resistance.
* Non-contact forces act on objects without physical contact. Gravity is a classic example, alongside magnetism and electrostatic forces.
* Gravity is not the only non-contact force. The other fundamental forces, like electromagnetism, are also non-contact forces but are not governed by the laws of gravity.
* The strength of gravity is dependent on mass. Objects with very little mass have a negligible gravitational pull. This is why we don't feel the gravitational attraction between ourselves and a pencil, for instance.
In summary:
While gravity is a universal force, it's not the only one in the universe. Many forces, especially contact forces, do not operate according to the laws of gravity.
