In Newton's law of universal gravitation, the magnitude of the gravitational force between two point masses is $F=\frac{GmM}{r^2}$. Which two factors determine the value of $F$ for a given $G$?

• A. The distance between the objects ($r$) and the velocity of one object ($v$)
• B. The masses ($m$ and $M$) and the net electric charge on the objects ($q$)
• C. The masses ($m$ and $M$) and the acceleration due to gravity ($g$)
• D. The two masses ($m$ and $M$) and the distance between their centers ($r$)

Answer: (D)