Contact force: Contact force is the force which is caused by the contact of two macroscopic objects.
Gravitational force: It is defined as the force of attraction between the two objects of masses and they are at certain distance. [tex]F=\frac{Gmm}{r^{2} }[/tex]
The force of electromagnetism: This is the force which is in between the charge particles whether the charge particles are moving or not.
Push force: It is the force which is generated by pushing any object.
Therefore, by the above definitions the force of electromagnetism is the result from charge particles.
