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Q: Identify the given law/principle. "The rate of change of momentum of a body is directly proportional to the external force applied on the body and takes place in the direction of the applied forces."
  • A. Newton's second law of motion
  • B. Newton's third law of motion
  • C. Newton's law of collision
  • D. Principle of conservation of momentum
Correct Answer: Option A - Newton's second law of motion:- It states that the rate of change of momentum of a body is directly proportional to the net external force applied on it and the change in momentum takes place in the direction in which the force is applied. Newton's first law of motion:- It states that Each body continues to be in its state of rest or uniform motion in a straight line unless it is compelled by some external force to change its state. Law of conservation of momentum:- The sum of momentum of the two objects before collision is equal the sum of momentum after the collision provided there is no external unbalanced force acting on them.
A. Newton's second law of motion:- It states that the rate of change of momentum of a body is directly proportional to the net external force applied on it and the change in momentum takes place in the direction in which the force is applied. Newton's first law of motion:- It states that Each body continues to be in its state of rest or uniform motion in a straight line unless it is compelled by some external force to change its state. Law of conservation of momentum:- The sum of momentum of the two objects before collision is equal the sum of momentum after the collision provided there is no external unbalanced force acting on them.

Explanations:

Newton's second law of motion:- It states that the rate of change of momentum of a body is directly proportional to the net external force applied on it and the change in momentum takes place in the direction in which the force is applied. Newton's first law of motion:- It states that Each body continues to be in its state of rest or uniform motion in a straight line unless it is compelled by some external force to change its state. Law of conservation of momentum:- The sum of momentum of the two objects before collision is equal the sum of momentum after the collision provided there is no external unbalanced force acting on them.