Explanation:

- Option 1: Universal law of gravitation

- Explains the force of attraction between two masses.

- Not specifically about a quantitative definition of general force.

- Option 2: Second law of motion

- Describes how force, mass, and acceleration are related.

- Formula: F = ma (Force equals mass times acceleration).

- Correct Answer: Provides a quantitative definition of force.

- Option 3: First law of motion

- Known as the law of inertia.

- States that an object stays at rest or in uniform motion unless acted upon by a force.

- Does not define force quantitatively.

- Option 4: Third law of motion

- Focuses on action and reaction forces.

- States that for every action, there is an equal and opposite reaction.

- Does not provide a definition of force in terms of measurement.