A ball balanced on a vertical rod is an example of

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NDA (Held On: 22 April 2018) General Ability Test Previous Year paper
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  1. Stable equilibrium
  2. Unstable equilibrium
  3. Neutral equilibrium
  4. Perfect equilibrium

Answer (Detailed Solution Below)

Option 2 : Unstable equilibrium
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CONCEPT

  • Equilibrium: It is a state where resultant of all forces acting on a body is zero.
  • Stable equilibrium: A system is said to be in stable equilibrium if, when displaced from equilibrium, it experiences a net force or torque in a direction opposite the direction of the displacement.
  • The potential energy is minimum in this case.

F1 J.K 12.6.20 Pallavi D6

  • Unstable equilibrium: A system is in unstable equilibrium if, when displaced from equilibrium, it experiences a net force or torque in the same direction as the displacement from equilibrium.
    • The potential energy is maximum in this case.

F1 J.K 12.6.20 Pallavi D7

  • Neutral equilibrium: A system is in neutral equilibrium if its equilibrium is independent of displacements from its original position.
    • The potential energy remains constant in this case.

F1 J.K 12.6.20 Pallavi D8

EXPLANATION

  • If a ball is placed on vertical rod, it is in unstable equilibrium because once it is displaced from its place, it will experience the net force in the direction of displacement and never come back to its original position.
  • The potential energy of the ball is maximum at this point.

 

F1 J.K 12.6.20 Pallavi D9

∴ Option 2 is correct.

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