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Physics · LAWS OF MOTION
हिन्दीConsider the following statements regarding Newton's laws of motion: (A) The rate of change of momentum of a body is directly proportional to the applied external force and takes place in the direction of force. (B) Impulse is a scalar physical quantity equal to the product of average force and time duration. (C) Newton's second law is a vector law, which can be applied independently along three mutually perpendicular component axes. (D) Internal forces acting between particles of a system can alter the total linear momentum of the system as a whole. Which of the above statements are correct?
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Correct answer · Option D
\( (A) \) and \( (C) \) only
Explanation
Statement (A) is correct (definition of Newton's 2nd law). Statement (B) is false because impulse is a vector quantity. Statement (C) is correct (\( F_x = m a_x, F_y = m a_y, F_z = m a_z \)). Statement (D) is false because internal forces cancel out in pairs and cannot change total system momentum.
