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Q11 (CDS-I/2026) Science & Technology › Basic Science (Physics, Chemistry, Biology)

Which one of the following statements qualitatively explains the second law of motion?

Result
Your answer: —  Â·  Correct: D

Explanation

Newton's Second Law of Motion states that the rate of change of momentum of an object is directly proportional to the applied unbalanced force and takes place in the direction in which the force acts. Mathematically, it is expressed as F = dp/dt. Since momentum (p) is the product of mass (m) and velocity (v), for a constant mass, the law simplifies to F = ma (Force = mass × acceleration).

  • Option A: Relates to torque and angular momentum in rotational mechanics.
  • Option B: The rate of change of displacement is velocity.
  • Option C: The rate of change of acceleration is known as 'jerk'.
  • Option D: Correctly identifies the fundamental definition of the second law, where force is the time derivative of linear momentum.
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