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Question 5437
NEET Physics · Hard

Laws of Motion: Advanced Newton's Laws MCQ

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Advanced Newton's LawsHardQuestion 5437

Question

A block of mass m pressed against wall by force F at angle θ to wall. Minimum F to prevent sliding (friction μ):
  1. A
    mg/μ
  2. B
    mg/(μcosθ + sinθ)
    Correct
  3. C
    mg/sinθ
  4. D
    mg/(μsinθ + cosθ)

Correct answer

mg/(μcosθ + sinθ)

Explanation

Normal force N = Fcosθ. Friction = μFcosθ. Equilibrium: Fsinθ + μFcosθ = mg → F = mg/(sinθ + μcosθ).

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