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When a moving body is suddenly stopped a...

When a moving body is suddenly stopped a long time after coming to rest

A

frictional force increases

B

roughness is found on the road

C

tyres of the vehicles burst

D

the frictional force reduces to zero as it is a self adjusting force

Text Solution

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The correct Answer is:
To solve the question regarding what happens when a moving body is suddenly stopped and remains at rest for a long time, we need to analyze the situation step by step. ### Step-by-Step Solution: 1. **Understanding the Situation**: - A body is moving and then is suddenly stopped. After this sudden stop, the body comes to rest. 2. **Condition of the Body at Rest**: - When the body is at rest, it means that there is no relative motion between the body and the surface it is on. 3. **Friction Force Analysis**: - Friction is a force that opposes the relative motion between two surfaces. Since the body is at rest and there is no tendency for it to move, there is no relative motion to oppose. 4. **Self-Adjusting Nature of Friction**: - Friction is a self-adjusting force. This means that it only acts when there is a tendency for relative motion. If there is no tendency for motion, the friction force will adjust to zero. 5. **Conclusion**: - Since the body is at rest and there is no relative motion, the friction force acting on the body will be zero. ### Final Answer: Thus, when a moving body is suddenly stopped and remains at rest for a long time, the friction force reduces to zero because there is no relative motion.
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