Step 1: Understanding the Concept:
This problem applies the laws of classical mechanics to biomechanics and sports performance. Newton’s Laws of Motion govern how forces interact with objects to create or change movement. When analyzing why a stationary object begins to move, we look at the concept of inertia—the natural tendency of any physical object to resist changes to its current state of motion.
Step 2: Detailed Explanation:
Let's analyze Newton's First Law of Motion (often called the Law of Inertia):
- This law states that an object at rest will remain at rest, and an object in motion will continue moving at a constant velocity along a straight line, unless acted upon by an external net unbalanced force.
- A football sitting on the pitch is in a state of static equilibrium. The downward force of gravity is perfectly balanced by the upward normal force of the ground.
- The football has mass, which means it possesses inertia. It is completely incapable of spontaneously starting its own movement.
- When an athlete kicks the ball, the player's foot applies an abrupt external unbalanced muscular force. This force overcomes the ball's static inertia and causes it to change its velocity and accelerate across the field.
Therefore, a stationary football moving only after being kicked is a direct manifestation of Newton’s First Law. This matches option (B).
Step 3: Final Answer:
The football moves because of Newton's First Law, matching option (B).