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NDA 2 2025 GAT, question 54

Topic: Physics

Q54

Which one of the following statements for second law of motion is NOT correct ?

  1. (a) The net force on a body is proportional to that body’s acceleration
  2. (b) The net force on a body is in the same direction as the acceleration
  3. (c) The time rate of change of momentum is equal to force
  4. (d) The net force on a body is proportional to that body’s momentumCorrect answer

Solution.

Answer: (d) The net force on a body is proportional to that body’s momentum

  1. Newton’s second law is F=dp/dt, or F=ma for constant mass.
  2. Force is related to the rate of change of momentum, not to momentum itself.
  3. A body may have nonzero momentum while experiencing zero net force.