Frank L. H. Wolfs
Department of Physics and Astronomy, University of Rochester, Slide 40
Newton's gravitational law.
¥Newton's gravitational law states that two objects attract each other with a force that is proportional to the product of their masses and inversely proportional to the square of their distance:

¥Fgrav = G M1 M2 / r122

¥Newton's gravitational law was very successful in describing the motion of the moon, the planets, and many other objects in our universe.
¥However, Newton's gravitational law was also clearly inconsistent with Einstein's special theory of relativity.
¥Why ÉÉ.. since the distance r12 depends on the reference frame, the force also depends on the reference frame used.