Two identical blocks are kept on rough inclined plane (µ = …

Physics Newton's Laws of Motion Friction and Frictional Force MCQ (Single Correct)

Two identical blocks are kept on rough inclined plane (µ = 0.5). The blocks are connected with light string. If mg < F < 2mg, then -

Friction force on block ‘A’ is in upward direction

Friction force on block B may be either in upward direction or downward direction

Friction on block ‘A’ depends upon force ‘F’

Friction force on block ‘B’ may be zero

Text Solution

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The correct answer is:

Figure shows forces acting along the string

∴ f + = F – mg

⇒ f = F –

∴ If F < ⇒ f: – ve ⇒ Friction force on block ‘B’ is in upward direction.

F > ⇒ f: + ve ⇒ friction force on block ‘B’ is in downward direction.

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