Types of forces

1. Contact force

A contact force is a force that acts at the point of contact of two objects, such as normal force, friction, and tension.

The normal force denoted by N is the perpendicular force to the surface of contact. An object at rest on the floor is subject to a normal force that balance its weight.

2. Non-contact force

A non-contact force, or at a distance force is a force applied to an object by another body that is not in direct contact with it, such as gravitational force, electric force, magnetic force, or strong and weak nuclear forces.