Question

The magnitude of the external force acting on moving bodies can be known directly by

• A. Law of conservation of angular momentum
• B. Newton’s first law of motion.
• C. Newton’s second law of motion.
• D. Law of conservation of energy.

Hint:

When in doubt, remember that Newton's second law is the foundation for finding forces in motion, as it links force directly to acceleration.

Answer 1

The Correct Option is C

According to Newton’s second law of motion, the external force acting on a body is directly proportional to the rate of change of momentum. This law provides a direct relationship between the force acting on a body and its acceleration, which is the key to calculating the magnitude of the external force acting on moving bodies. Thus, the correct answer is: \[ \boxed{\text{Newton’s second law of motion.}} \]