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Question

Study the following scenarios and identify what type of inertia tends to resist the change.

1. When the bus suddenly starts, the passenger on the bus tends to fall backwards.

2. When a passenger jumps out of moving bus, he falls down.

3. A cyclist riding on a level road does not come to rest immediately even he stops pedalling.


A

All are due to the inertia of rest.

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B

Only 1 and 3 are due to the inertia of rest and 2 is due to the inertia of motion.

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C

Only 1 is due to the inertia of rest and others are due to the inertia of motion.

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D

Only 1 is due to the inertia of motion and others are due to the inertia of rest.

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Solution

The correct option is C

Only 1 is due to the inertia of rest and others are due to the inertia of motion.


The inertia of rest is the inability of the body to change the state from rest to motion in the absence of an unbalanced force.
The inertia of motion is the inability of the body to change the state from motion to rest in the absence of an unbalanced force.

In the first case when the bus starts suddenly, the passenger tends to fall backward because the passenger’s body resists the change of state from rest to motion. Thus, it is an example for inertia of rest.

In the second case, when the passenger jumps out of the moving bus, he falls down because the passenger’s body resists the change in the state from motion to rest. Thus, it is an example for inertia of motion.

In third, when the pedaling was stopped the cycle does not stop immediately because the cycle resists the change of state from motion to rest. Thus, it is due to the inertia of motion.


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