The body will move only when

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URSC ISRO Technical Assistant Electronics 13 November 2016 Official Paper
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  1. Force of friction = applied force
  2. Force of friction < applied force
  3. Force of friction > applied force
  4. All of the above

Answer (Detailed Solution Below)

Option 2 : Force of friction < applied force
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Detailed Solution

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The below graph shows the relationship between the applied force (F) and the frictional force developed on the body.

corrected force 1

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Observation:

  • It is observed that the block does not move until the applied force F reaches a maximum value Fmax given by:

          Fmax = μ N

  • As the applied force F goes beyond Fmax, the body starts moving now experience slightly less f frictional force.
  • So, it is only when the applied force is greater than the frictional force will the body starts to move.
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