Here's why:

* Mass (m) is measured in kilograms (kg).

* Gravity (g) is measured in meters per second squared (m/s²).

* Force (F) is calculated using Newton's Second Law of Motion: F = m * a, where 'a' is acceleration. Since gravity is a type of acceleration, we can substitute 'g' for 'a' in the equation.

Therefore: F = m * g

This means the product of mass and gravity gives you the force exerted on an object due to gravity.