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A chain of length L is placed on a horizontal surface as shown in figure. At any instant x  is the length of chain on rough surface and the remaining portion lies on smooth surface. Initially  x = 0, a horizontal force P is applied to the chain (as shown in figure). In the duration  x  changes from  x = 0 to  x = L, for chain to move with constant speed.
  • a)
    The magnitude of P should decrease with time
  • b)
    The magnitude of P should increase first and then decrease with time
  • c)
    The magnitude of P should decrease first and then increase with time
  • d)
    The magnitude of P should increase with time
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A chain of lengthLis placed on a horizontal surface as shown in figure...
For chain to move with constant speed P needs to be equal to frictional force on the chain. As the length chain on the rough surface increases. Hence, the friction force fk = μkN increase.
Hence, magnitude of P should increase with time.
The correct answer is: The magnitude of P should increase with time
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Most Upvoted Answer
A chain of lengthLis placed on a horizontal surface as shown in figure...
For chain to move with constant speed P needs to be equal to frictional force on the chain. As the length chain on the rough surface increases. Hence, the friction force fk = μkN increase.
Hence, magnitude of P should increase with time.
The correct answer is: The magnitude of P should increase with time
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A chain of lengthLis placed on a horizontal surface as shown in figure. At any instantxis the length of chain on rough surface and the remaining portion lies on smooth surface. Initially x = 0, a horizontal forcePis applied to the chain (as shown in figure). In the durationx changes from x= 0 tox=L, for chain to move with constant speed.a)The magnitude ofPshould decrease with timeb)The magnitude ofPshould increase first and then decrease with timec)The magnitude ofPshould decrease first and then increase with timed)The magnitude ofPshould increase with timeCorrect answer is option 'D'. Can you explain this answer?
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