Q:
# How did Sir Isaac Newton discover gravity?

Although never fully substantiated, a legend exists that explains how Sir Isaac Newton discovered gravity after watching an apple fall from a tree. There is some evidence though that this incident did in fact occur. William Stukeley, who was a colleague of Newton, and his assistant John Conduitt both wrote about the event taking place in manuscripts.

Continue Reading
Credit:
De Agostini Picture Library
De Agostini Picture Library
Getty Images

This event is often cited as the catalyst for Newton's discovery of gravitational force, which led to later discoveries, such as Newton's laws of motion. Newton’s law of gravity explains how all particles in the universe attract other particles with a force that is equal to the product of the particles' mass and the distance between the particles. This law is expressed in a mathematical equation used to calculate gravitational force.

The discovery of the causes and effects of gravitational force allowed Newton to create the three laws of motion. The first law of motion is that force is constant until it is interrupted by an external force. The second law is a mathematical equation used to calculate mass, acceleration and force. The last law of motion states: "For every action, there is an equal and opposite reaction." Newton published these discoveries and many others in 1687 in a book titled "Principia."

Learn more about Inventions-
Q:
## What honors did Sir Isaac Newton get?

A: Sir Isaac Newton received several honors including knighthood, the consideration as the top mathematics professor at Cambridge, a seat in Parliament and th... Full Answer >Filed Under: -
Q:
## What did Sir Isaac Newton discover?

A: Throughout his life, Sir Isaac Newton made numerous discoveries in physics, mathematics, optics and astronomy. Due to these discoveries, he is considered t... Full Answer >Filed Under: -
Q:
## Where did Sir Isaac Newton live?

A: Sir Isaac Newton lived in England. He was born in Lincolnshire and moved around a bit until settling in Cambridge, where he spent the majority of his profe... Full Answer >Filed Under: -
Q:
## What were Sir Isaac Newton's interests?

A: Sir Isaac Newton nurtured a wide number of interests, which spanned various academic disciplines. Among the most famous are optics, mechanics and mathemati... Full Answer >Filed Under: