»Types of forces
For simplicity sake, all forces (interactions) between objects can be placed into two broad categories:
Contact forces are those types of forces that result when the two interacting objects are perceived to be physically contacting each other.
Examples: Frictional forces, tensional forces, normal forces, air resistance forces, and applied forces.
Action-at-a-distance forces are those types of forces that result even when the two interacting objects are not in physical contact with each other, yet are able to exert a push or pull despite their physical separation.
Examples: Gravitational forces, Magnetic forces, etc.
When balanced forces are applied to an object, there will be no net effective force acting on the object. Balanced forces do not cause a change in motion.
Unbalanced forces acting on an object change its speed and/or direction of motion. It moves in the direction of the force with the highest magnitude.Balanced and Unbalanced Forces