Force

Force:  the means that result in speeding up or distorting an object.

A force is a push or pull upon an object resulting from the object’s contact or interaction with another object. Every time there is contact between two objects, there is a force upon each of the objects. When the contact stops, the two objects will not feel the force. Forces are simply present as a result of an interaction or contact.

All forces between objects can be put into two main categories:

Contact forces

Forces from action-at-a-distance

Contact forces are forces that happen when the two contacting or interacting objects seem to be actually touching each other. Examples of contact forces include normal forces, applied forces, tensional forces, air resistance forces and frictional forces.

Action-at-a-distance forces are forces that happen whiles the two interacting objects are not in physical or bodily contact with each other, however are able to apply a push or pull regardless of them not touching one another. Examples of action-at-a-distance forces include gravitational forces. For instance, the sun and the earth exert a gravitational pull on each other regardless of the huge space between them. Electric forces are also action-at-a-distance forces. For instance, the protons in the nucleus of an atom and the electrons outside the nucleus exhibit an electrical pull towards each other regardless of the small space between them. Another example; magnetic forces are action-at-a-distance forces. For instance, two magnets can apply a magnetic pull on each other even if they are a little distance apart.

Force is a quantity that is measured in Newton.

A force is a vector quantity that has both magnitude and direction.