Explanation:

- Second law of motion: This is the correct answer. Newton's Second Law provides a quantitative definition of force. It states that force equals mass times acceleration (F = ma), showing a direct relationship.

- Universal law of gravitation: Describes the gravitational force between two masses but doesn't define force in a general sense.

- First law of motion: States that an object will remain at rest or in uniform motion unless acted upon by a force. It describes inertia, not a quantitative force.

- Third law of motion: Explains that every action has an equal and opposite reaction. It discusses force interactions but doesn't quantify force.

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