Question

What did Aristotle get wrong in his mechanics? How was this fixed later on by Sir Isaac Newton?

Answer 1

Aristotle said that heavier objects fall faster than lighter objects. Finally, in the 16th century Galileo disproved this theory by dropping two balls of different masses from the Leaning Tower of Pisa showing that they both fell at the same speed. Newton's Law of Gravitation explains the results of Galileo's experiment, showing that the acceleration of an object near the earth's surface is always the same g=GM/R2=9.80m/s2g=GM/R2=9.80m/s2, where G is the gravitational constant, R is the distance of the object to the center of the earth, and M is the mass of the earth. So by finding the acceleration using the new law he helped in establishing the new and proper Gravitational Motion concepts.