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Most Important Selected Qs for JEE AdvancedPhysicsLaws of Motion

Figure shows three blocks on a rough surface under influence of a force P of same magnitude in all the three cases. Coefficient of friction is same between each block and ground. What possible relation holds between magnitudes of normal reaction and friction forces. [Assume that blocks do not overturn about edge, f _A, f _ B & f _ C are frictional forces & ~N _ A , N _ B & ~N _ C are reactions]

Options

  1. AN _ A N _ C N _ B
  2. Bf _ A f _ C f _ B
  3. Cf _ C f _ A = f _ B
  4. DN _ C N _ A = N _ B

Correct answer

C. f _ C f _ A = f _ B

Step-by-step solution

aligned & N = mg + P & f _ = N & Friction may be static =P aligned aligned & N=m g-P & f_ = N & Friction may be static =P aligned aligned & N = mg & f _ = N aligned Friction may be static

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