What is defined as the product of mass and velocity?

• A. Inertia
• B. Force
• C. Momentum
• D. Energy

Answer: (C)

The correct choice is momentum, which is defined as the product of mass and velocity. Momentum demonstrates how much motion an object has, and it depends on two factors: how much matter (mass) is in the object and how fast that object is moving (velocity). This concept is crucial in physics as it helps to determine the behavior of moving objects during collisions and interactions.

To further understand why momentum is uniquely defined this way, consider its mathematical representation: momentum (p) can be expressed as p = m × v, where m represents mass and v represents velocity. This formula illustrates that as either the mass or velocity of an object increases, so does its momentum, emphasizing the significance of both parameters in the context of movement.

In contrast, inertia refers to an object's resistance to changes in its state of motion, while force is an interaction that causes an object to accelerate, described by Newton's second law of motion (F = m × a). Energy represents the ability to do work or cause change but is not directly about an object's motion in the way momentum is. Thus, in the context of the question, momentum is the term that specifically connects mass and velocity.