Define inertia. Discuss it's types with …

The inherent property of a material body by virtue of which it cannot change, by itself , its state of rest or of uniform motion in a straight line is called Inertia. DIFFERENT TYPES OF INERTIA:- 1) Inertia of rest - The tendency of a body to remain in its position of rest is called Inertia of rest. Example : A person standing in a bus falls backwards when the bus suddenly starts moving forward. When the bus moves , the lower part of his body begin to move along with the bus while the upper part of the body continue to remain in rest due to Inertia of rest. That is why , a person falls backwards when the bus starts. 2) Inertia of motion - The tendency of a body to remain in the state of uniform motion in a straight line is called Inertia of motion. Example : When a bus suddenly stops, a person sitting in it falls forward. As the bus stops, the lower part of his body comes to rest along with the bus while the upper part of the body continue to remain in the motion due to Inertia and fall forward. 3) Inertia of direction - The inability of the body to change by itself its direction of motion is called Inertia of direction. Example : When a bus takes a sharp turn, a person sitting in the bus experience a force acting away from the centre of the curved path due to his tendency to move in the original direction. He has to hold on a support to prevent himself from swaying away in the turning bus.

The tendency of a body to continue in its state of motion is called inertia of motion .
Example: Rider Falls forwards when a galloping horse stop suddenly. When the horse stops, the Rider on account of inertia of motion, continues moving and hence falls in forward direction.