# Newton's Laws

## What are Newtons Laws?

Newton's laws are three physical laws that are about motion, they describe the relationship between a body and the forces upon it, and its motion in response.

## Isaac Newton's Life

Isaac Newton was an physicist, astronomer and mathematician who is recognized as the most influential scientists of all time. He was born on January 4th 1643, in Woolsthorpe, Lincolnshire. His father was a famer that died three months before his son, Isaac was born, his mother remarried and his care was taken by his grandparents. In 1661 he went to Cambridge University where he gained interest in mathematics, physics and astronomy. However the university was forced to close and he moved back to his home town and thought about gravity.

## 1-Newton's First law

In Newton's first law every object in the state of motion remains in the state of motion unless an external (outward) force is applied. An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless a an unbalanced forced is on it.

An example: Lets take an airplane flying at a constant speed. Now the aircraft accelerates and airspeed increases, the aircraft no longer accelerates but holds a new, higher, constant airspeed.

## 2-Newton's second law

In newtons second law acceleration is produced when a force act upon a mass, greater the mass the greater amount of force needed to accelerate the object. Heavier objects require more force to move the same distance as lighter objects.

## 3-Newton's third law

Newtons third law indicates for every action there is an equal and opposite reaction. This means that for every force there is a reaction force that is equal in size, but opposite direction. Whenever an object pushes another object it gets pushed back in the opposite direction equally as hard.