Discussion
A person is standing freely in a bus. When the bus starts suddenly he gets thrown backwards (reverse to the direction of motion of the bus). This is an example of which type of inertia ?
Answer: A
It is an example of inertia of rest.
Inertia of rest is the tendency of a body at rest to stay at rest. When the bus starts suddenly, the passenger's feet, in contact with the floor, move forward with the bus, but the upper part of the body tends to remain where it was. So the passenger falls backwards, opposite to the bus's motion.
Inertia of motion is the opposite case: when a moving bus stops suddenly, passengers are thrown forwards. Inertia of direction is shown when a bus turns a corner and passengers lean outwards. 'Force' is not a type of inertia.
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