# What is force?

Force can be defined as  agent that causes a body to change its state of rest or make it change its state and direction of its uniform motion when it  come in contact with the body. It can also be describe as external agent when applied to a body changes its state of rest or motion. The unit of force is Newton N. There are two types of force, contact and field forces

It can be calculated using its relationship with work, which is given as :

Work done = force x distance covered, therefore from the this force is given as

$FORCE\quad =\quad \frac { WORK\quad DONE }{ DISTANCE\quad COVERED }$

Contact forces: They are the type of forces which only act when they are in contact or in touch with body they act on. The examples of such forces are push or pull, tension, reaction and frictional forces.  forces of friction is force that opposes the motion of a body. The frictional forces are  given as

F = μR, μ = coefficient of static friction, and R = reaction

Field forces: These are forces whose action does not require their contact with the body they act on. The examples are , electrical or electrostatic, and magnetic forces. The actions of these kinds of force are felt at a distance.

Gravitational forces are  forces with which earth attracts object to its center.  It is given as

$Fg\quad =\frac { GMm }{ { r }^{ 2 } }$

Electrostatic force is a force between two charged bodies.

Magnetic forces are type that exist around bar magnet of current carrying conductor. Magnetic forces are also responsible for  attraction between the north and South Pole of magnet.

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