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Q: The rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the force. This rule is known as :
  • A. Newton's First Law of Motion
  • B. Newton's Fourth Law of Motion
  • C. Newton's Second Law of Motion
  • D. Newton's Third Law of Motion
Correct Answer: Option C - Newton’s second law is a quantitative description of the changes that a force can produce on the motion of a body. It states that the rate of change of the momentum of a body is equal to both magnitude and direction of the force imposed on it. The momentum of a body is equal to the product of its mass and its velocity. Momentum, like velocity, is a vector quantity, having both magnitude and direction. Example: Pulling the hands gradually in the direction of the ball while catching helps in reducing the impact of force applied by the ball on the hands of the cricketer as the relative velocity of the ball with respect to hands of the player is decreased and hence reduces the momentum of the ball gradually.
C. Newton’s second law is a quantitative description of the changes that a force can produce on the motion of a body. It states that the rate of change of the momentum of a body is equal to both magnitude and direction of the force imposed on it. The momentum of a body is equal to the product of its mass and its velocity. Momentum, like velocity, is a vector quantity, having both magnitude and direction. Example: Pulling the hands gradually in the direction of the ball while catching helps in reducing the impact of force applied by the ball on the hands of the cricketer as the relative velocity of the ball with respect to hands of the player is decreased and hence reduces the momentum of the ball gradually.

Explanations:

Newton’s second law is a quantitative description of the changes that a force can produce on the motion of a body. It states that the rate of change of the momentum of a body is equal to both magnitude and direction of the force imposed on it. The momentum of a body is equal to the product of its mass and its velocity. Momentum, like velocity, is a vector quantity, having both magnitude and direction. Example: Pulling the hands gradually in the direction of the ball while catching helps in reducing the impact of force applied by the ball on the hands of the cricketer as the relative velocity of the ball with respect to hands of the player is decreased and hence reduces the momentum of the ball gradually.