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Which one of the following is not a conservative force ?

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NDA 02/2021: General Ability Test Previous Year paper (Held On 14 Nov 2021)
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  1. Frictional force
  2. Electric force
  3. Gravitational force
  4. Spring force

Answer (Detailed Solution Below)

Option 1 : Frictional force
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Detailed Solution

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CONCEPT:

  • Conservative force: A force is conservative if the work done by the force in displacing an object from one point to another point is independent of the path followed by the object and depends only on the endpoints.
    • Electrostatic forces, gravitational forces, elastic forces, magnetic forces, etc and are examples of a conservative force.
  • Non-conservative forces: A force is said to be non-conservative if work done by or against the force in moving a body from one position to another, depends on the path followed between these two positions.
    • Example:  Frictional force, Viscous force, Airdrag, etc.

EXPLANATION:

F1 P.Y Madhu 19.05.20 D2

  • If a body is moved from position A to another position B on a rough table, work done against frictional force shall depend on the length of the path between A and B and not only on position A and B.
  • Therefore, in non-conservative force work done by or against the force in moving a body from one position to another, depends on the path followed between these two positions. Therefore option 1 is correct
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