# What do Newton’s first, second, and third laws say?

Isaac Newton was an important English physicist. Born on December 25, 1642, he is considered the first man to demonstrate that the natural laws that govern the movement on Earth and those that govern the movement of the planets or stars are the same. One of his most relevant contributions in the history of modern science are the three Newton laws. These norms explain the movement of bodies, as well as their causes and effects.

Known as the law of inertia Newton postulates the following: “Every body continues in its state of rest or uniform motion in a straight line, not far from the forces imposed to change its position.”

According to this first law, a body cannot change its state by itself; for it to come out of rest (zero speed) or a uniform rectilinear motion, it is necessary that some force act on it. Therefore, if no force is applied and a body is in a state of rest, it will stay that way; if a body was in motion, it will continue to be with uniform motion at constant speed.

For example: a man leaves his motorcycle parked in the garage of his house or that of a friend. There is no force acting on the car, so the next day, the vehicle is still in the same place.

Call force law says the following: “The change in motion is directly proportional to the printed motive force and occurs according to the straight line along which that force is printed.”

Newton’s second law states that there is a relationship between the force exerted on a body and its acceleration. This relationship is direct and proportional, the force exerted on a body is directly proportional to the acceleration it will have. In summary, the acceleration depends on the direction, magnitude, the direction of the total applied force and the mass of the object.

For example: the more force a person applies when kicking a soccer ball, the more chance there is for the ball to cross the middle of the field, because its acceleration is increased by impact.

In the law of action and reaction Isaac Newton explains:With every action an equal and opposite reaction always occurs, it means that the mutual actions of two bodies are always equal and directed in the opposite direction ”.

Newton’s third law states that when a body exerts a force on another, the latter responds with a reaction of equal magnitude and direction but in the opposite direction. The force exerted by the action corresponds to a reaction. For example: when a man trips over an object, he will receive from the object the same force that he applied with the blow.

Isaac Newton’s three laws are relevant because they are the basis of mechanics and have helped to understand the motion of the planets when combined with the universal law of gravitation. In addition, these laws have also been the basis for understanding and explaining how machines work because they are used to analyze the forces acting on an object and determine its state of motion.

This has a myriad of practical applications: bridges, buildings, roads, ships, airplanes, cars, rides, and much more are designed with these laws in mind. For this reason, Newton’s three laws have great scientific and historical value. They are part of the great inventions in the history of mankind.

Source-larepublica.pe