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# Force and laws of motion

Inertia and mass

Tanusri Gururaj, Academic content writer of Physics at Edumarz

• Inertia is the natural tendency of objects to resist change in the state of motion or rest.

• A body’s mass is the measure of its inertia.

• The heavier the body, the more will be its inertia.

• Examples of inertia in daily life:

1. When a car in the state of rest suddenly starts moving, the passengers experience a backward force.

Reason: Due to inertia, the body of passengers continues to be in a state of rest but, since their feet are in contact with the floor of the car, they experience a backward force.

1. Similarly, when a car in the state of motion suddenly stops moving, the passengers experience a forward force.

Reason: Due to inertia, the body of passengers continues to be in the state of motion even when the car stops.

1. When a dusty carpet is beaten, it comes in motion but the dust remains in a state of rest due to inertia. Thus, the dust falls off.