Which law of Newton provides a quantitative definition of force?

Second law of motion

The correct answer is option 2. Second law of motion.

The law of Newton that provides a quantitative definition of force is Second law of motion.

Newton's second law of motion states that the force (\( F \)) acting on an object is equal to the mass (\( m \)) of the object multiplied by its acceleration (\( a \)). Mathematically, it can be expressed as:

\[ F = m \cdot a \]

This law provides a quantitative relationship between force, mass, and acceleration, stating that the force applied to an object is directly proportional to the acceleration produced and inversely proportional to the mass of the object.