Wednesday, 20 April 2016

Type of Inertia

The  inertia  is  of  three  types
(i)Inertia  of  rest
(ii)    Inertia  of  motion
(iii)   Inertia  of    direction.
(i)     Inertia  of  rest

It  is  the  inability  of  the  body  to  change  its  state  of  rest  by  itself.
Examples
(i)  A  person  standing  in  a  bus  falls  backward  when  the  bus
suddenly starts moving. This is because, the person who is initially at
rest  continues  to  be  at  rest  even  after  the  bus  has  started  moving.
(ii) A book lying on the table will remain at rest, until it is moved
by  some  external  agencies.
(iii) When a carpet is beaten by a stick, the dust particles fall off
vertically downwards once they are released and do not move along the
carpet  and  fall  off.
(ii)  Inertia  of  motion
Inertia  of  motion  is  the  inability  of  the  body  to  change  its  state  of
motion  by  itself.
Examples
(a) When a passenger gets down from a moving bus, he falls down
in  the  direction  of  the  motion  of  the  bus.
(b) A passenger sitting in a moving car falls forward, when the car
stops  suddenly.
(c)  An  athlete  running  in  a  race  will  continue  to  run  even  after
reaching  the  finishing  point.
(iii)  Inertia  of  direction
It  is  the  inability  of  the  body  to  change  its  direction  of  motion  by
itself.
Examples
When a bus moving along a straight line takes a turn to the right,
the  passengers  are  thrown  towards  left.  This  is  due  to  inertia  which
makes the passengers travel along the same straight line, even though
the  bus  has  turned  towards  the  right.