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Concepts Of Physics MCQ Edition [Volume 1]PhysicsFriction

A block A placed on an inclined surface just starts to slide when the inclination reaches 30^ . If block A is replaced by another block B , it is observed that it just starts to slide when the inclination is 40^ .

Options

  1. AAll three of the above are possible
  2. BMass of A < Mass of B
  3. CMass of A > Mass of B
  4. DMass of A = Mass of B

Correct answer

A. All three of the above are possible

Step-by-step solution

The angle of repose is the minimum angle of inclination of a plane at which a block placed on it just begins to slide. The condition for the block to just start sliding is mg = _s mg , which simplifies to = _s , where _s is the coefficient of static friction between the block and the inclined surface. The angle of repose depends only on the nature of the surfaces in contact (coefficient of friction) and is completely independent of the mass of the block. Since blocks A and B have different angles of repose ( 30^ an

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