A passenger standing in a bus is thrown outward when the bus takes a sudden turn. This happens due to
(1) Outward pull on him
(2) Inertia of motion
(3) Change in momentum
(4) Change in acceleration
Answer: (2) This is the inertia of direction. It is the ability of the body to be in a state of the direction of motion .for example sun holds planets in a fixed elliptical path .this is one of the examples of inertia of direction. The inertia of direction is non-existent however inertia only applies to a body at rest or moving with a constant velocity. It is the property possessed by a body to resist change. In another way, we can say that if a body moves in a particular direction under the action of a force and if the force is removed then the will continue to move in the same direction unless stopped under the action of another opposing force for a body at rest it under the inertia of rest whereas inertia of motion is for bodies in motion.
