Force And Pressure

Force and pressure
FORCE&PRESSURE 
Force


  Force is the push which changes  the position
of Body or tend to change the position of body.
  

  Unit of force in SI system is Newton and in CGS system is Dyne.

      Relation between the Newton and Dyne

                                        1 N = 1 kg  x m/s2
                                               = 1000 g  x 100 cm/s2
                                               = 100000 gcm/s2 = 105 dyne
                                        1 N = 105 dyne

Types of Forces

There are different types of forces which are categorised into two groups, i.e. contact forces and non-contact forces.  

Contact Forces

·         Contact forces are those forces which come in action only when two objects are in the actual contact with each other.

·         These forces are further divided into  two groups, i.e. muscular forces and frictional force.

·         Every action has an equal and opposite reaction. Action-reaction  force are example of contact force.


        Muscular force 
      ·         The force which result due to the action of muscles is called muscular force.

·         Both human beings and animals exert muscular force to do some work, e.g. We use muscular force in our daily life activities like walking, jumping, climbing, stretching squeezing, etc.