The key feature of Newton's most important work was the law of
A) planetary motion.
B) action and reaction.
C) reciprocity.
D) universal gravitation.

Question

Quizplus · Accepted Answer

Newton's most important work was his publication of "Philosophiae Naturalis Principia Mathematica" (Mathematical Principles of Natural Philosophy) in 1687, which included his law of universal gravitation. This law stated that every object attracts every other object with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. This law explained not only the motion of objects on Earth but also the motion of planets in the solar system.

The Key Feature of Newton's Most Important Work Was the Law