Cameron Smith Carlisle English 3-1 February 15,2018 Sir Isaac Newton Sir Isaac Newton was an English mathematician and physicist, probably one of the best scientists in the world around his time. He made important discoveries to many types science. His discoveries and theories laid the foundation for much of the progress in science. Sir Isaac Newton was a mathematician and physics graduate who made our sciency world. In 1666, Sir Isaac Newton developed the theories of gravitation when he was about 23 years old. Then in 1686 he presented three laws of motion in the Principia Mathematica Philosophiae Naturalis. I believed that he first started studying the effect of gravity after watching …show more content…
‘’Any object will remain at rest or in motion in a straight line unless forced to change by the application of an external force.’’(pg 6) .”Objects in motion tend to stay in motion, and objects at rest tend to stay at rest, unless acted upon by an outside force”(pg 7). The second law explains how the velocity of an object can changes when an additional force is applied. The second law says that the force needed to accelerate an object equals the mass of the object multiplied by its acceleration. The third law states that for every action, there is an equal and opposite reaction. For example, when you stand on something soft, the object moves in or is pushed down. This is the “reaction” of your force on the soft object, and the soft object's reaction to you standing on …show more content…
The first law says that planets move around the sun on elliptical orbits. The second law says that a planet sweeps out equal areas in equal times. According to the third law, the square of the orbital time is related to the cube of the distance to the sun. Newton was convinced the planets must follow the same physical laws that are observed on Earth. This means there must be an unseen force acting on them. He knew from experiment that, in the absence of an applied force, a moving body will continue in a straight line forever. The planets, on the other hand, were moving in elliptical orbits. Newton asked himself what sort of force would make them do this. he realized that the answer was gravity .the very same force that causes an apple to fall to the ground on Earth. Newton made a mathematical formulu of gravity that explained both the motion of a falling apple and the motion of the planets. He showed that the gravitational force between any two objects is similar to the product of their masses and inversely proportional to the square of the distance between them. When applied to the motion of a planet around the sun, this theory explained all three of Kepler's