What are the types of force?

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You need to understand first the definition of force as being that action that produces different kinds of changes over an object. The force concept only exists in presence of two objects at least.

The type of force is given by physical relative position of two or more objects, such that:

- contact forces (the objects physically interact)

- distance forces (the objects are not connected)

The group of contact forces contains the following sub-groups, such that: applied forces, normal forces, friction forces, spring forces, tension forces, air resistance.

The group of distance forces contains the following sub-groups, such that: electric forces, magnetic forces, gravitational forces.

There exists formulas to evaluate different kinds of forces, such that:

Newton's second law: `F = m*a` (F = force exerted on object, m = mass of object that suffers the action of force, a = acceleration of the object)

Friction force: `F_f = mu*F_n` (`F_n` = normal force)

Gravitational force: `G = m*g` (`g = 9.8 N/Kg` gravitational acceleration)

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