Different Types Of Forces

By Author: Pierce Brosnan
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Introduction to different types of forces:

A force is that physical cause which changes the dimensions or the state of rest or the state of motion of a body.

kinds of forces:From the point of view of application of forces,they are classified in two categories,namely,1)the contact forces and 2) non-contact forces.

Contact Forces:

THE forces which acts on bodies when they are in actual contact are called the contact forces.

a)Frictional Forces:When a body is slided over a rough surface,a force acts on the body parallel to the surface in direction opposite to the motion of the body.This is called the frictional force or the force of friction.

like,a book placed on the table top is pushed to the right,the force of friction acts on the book towards the left.this force resists the motion of book on the rough surface.

b)Normal reaction force:When a body is placed on a surface,the body exerts a force on the surface,but the body does not move.This is because the surface exerts an equal and opposite force on the body normal to the surface which is called the normal reaction force.

c)Tension ...
... force as applied through strings:When a body is suspended by a string,the body pulls the string vertically downwards due to its weight W and the string pulls the body upwards by a force which balances the weight of the body. This force is called the tension force T.

d)Force exerted by a spring:A spring in its original form does not exert any force on the object attached to its end.A compressed spring pushes away the object attached at its end,while a stretched spring pulls in the object attached at its end.

Thus,keeping one end of the spring fixed if its other end id displaced, the spring exerts a force which is directly proportional to the displacement of spring and it is in direction opposite to the direction of displacement.This force is called the restoring force.

e)Force exerted during collision:When two bodies collide,equal and opposite forces act on each body which make them to move apart after the collision.

f)Force applied as a pull or push:When a body is pushed or pulled.its get displaced.

Non-contact Forces:

The forces which act on bodies without being physically touched,are called the non-contact forces.

a)Gravitational force:The force due to the pull of gravity is called the gravitational force.It causes motion in the body downward.It is the gravitational force due to which a body released from a height,falls down.

Example:A ball placed on a table starts rolling down when the table is tilted.

b)Electrostatic Force:The force between the two point charges placed at a separation is called the electrostatic force.Two like charges repel,while the unlike charges attract each other.

c)Magnetic force:The force between the two magnetic poles placed at a separation is called magnetic force.Two like poles repel,while the unlike poles attract each other.

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