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11th Class Physics Systems Of Particles & Rotational Motion / कणों के निकाय तथा घूर्णी गति Question Bank Systems Of Particles & Rotational Motion Conceptual Problems

  • question_answer
    If an external force can change the state of motion of CM of a body, how does the internal force of the brakes bring a car to rest?

    Answer:

                    Actually, it is not the external force which brings the car to rest. The internal force of the brakes on the wheel locks the wheel. Now a large frictional force comes into play between the wheels and the grounds. This force is external to the system and brings the car to rest.


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