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This led to his work on defining gravity. Newton told the story of seeing an apple fall to the ground from a tree which inspired him to wonder why it fell down, rather than up or across. He also noted that gravity keeps the moon in orbit. Newton described gravity as a pulling force that keeps people on the ground rather than floating off. His third law of motion says that ‘ for every action there is an equal and opposite reaction’.He created a mathematical formula for the second law of motion: F=ma (the force (F) needed is equal to the mass of the object multiplied by the rate of acceleration). The second law of motion is that the bigger the mass of an object, the bigger the force is needed to make it accelerate and move.
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The first of his three laws of motion states that an object will keep moving in the same direction unless a force acts on it to make it change direction, speed up or slow down.Isaac Newton and some of his handwritten notesīorn in 1643, Newton is famous for various scientific and mathematical contributions to our understanding of the world, including the three laws of motion, law of gravity, calculus and light.Look through the gallery below and see if you can spot the following This is because according to the old (Julian) form of calendar he was born on the 25th December 1642, but under the Gregorian calendar that we use today he was born on the 4th January 1643! Sometimes Newton’s year of birth is reported as 1642 and sometimes as 1643.Forces are measured in ‘Newtons’ after Newton’s work on motion.
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The famous story of an apple falling to the ground from a tree illustrates how Newton's work on gravity was inspired by things he observed in the world around him. He was also well known for his work on light and colour, and what is now called calculus (a branch of mathematics). Isaac Newton was born in 1643 and became famous for his work on gravity and his three laws of motion.
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