Class 11 Physics Laws of Motion Inertia


Inertia is the resistance of a body to change its state of motion.

  • A body at rest wants to be at rest
  • A body in motion wants to be in motion

Have you experienced jerk when brakes are suddenly applied to the vehicle?


This happens because initially the car was in motion; the body was also in motion. Later, due to the application of brakes, the car came to rest; but the body due to its inertia still wants to be in motion. Therefore, the body doesn’t come to rest at once and experiences jerk.

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