# Newton Law of motion

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Sir Isaac Newton was an English physicist who gave us three laws of motion; we called it Newton’s Law of motion. We discuss the explanation of “how Newton changed our understanding of the universe?” with his three laws of motion.

#### First Law of Motion

An object at rest will remain at rest unless acted on by an unbalanced force. In the similar way, an object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
It simply means that every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it, This is also called the law of inertia.
Example:
When we start the car, it is going from rest to motion and we can feel that some force are pushing us backward which is the external force generated by the car. Now when the car is in motion, we are also in the same state (that is motion). When we apply the break the car stopped but our body is still in motion and it results we are moving forward. To avoid this, we are using the seat belt in the car.

#### Second Law of motion

According to the second law, acceleration is produced when a force acts on a mass of the object. The greater the mass of the object being accelerated the greater the amount of the force needed to accelerate the object.
Second law gives us the relationship between force, mass and acceleration.
F = Ma      where, F = force, M = mass of object and a = acceleration.

#### Third Law of motion

According to the third law, For every action there is an equal and opposite reaction.
Example:
When the cannonball is fired through the air, the cannon is pushed backward. The force pushing the ball out was equal to the force pushing the cannon back, but the effect on the cannon is less because it has a much larger mass than ball. In the similar way the kick when a gun fires a bullet forward.