The law of inertia

A body will preserve its velocity and direction so long as no force in its motion's direction acts on it.

Inertia is the resistance of any physical object to any change in its state of motion (this includes changes to its speed, direction or state of rest).

It is the tendency of objects to keep moving in a straight line at constant velocity.

The principle of inertia is one of the fundamental principles of classical physics that are used to describe the motion of objects and how they are affected by applied forces.

Inertia comes from the Latin word, iners, meaning idle, sluggish. Inertia is one of the primary manifestations of mass, which is a quantitative property of physical systems.

Isaac Newton defined inertia as his first law in his Philosophiæ Naturalis Principia Mathematica, which states.

The law of inertia is also important for Galileo's astronomy. He used this law to explain why we do not feel the earth's motion, and especially why objects falling on the surface of the earth move together with the earth.

This explanation is related to the law of relativity, which is also based on the constant acceleration of bodies.

In this way, Galileo succeeded in refuting the claims of his opponents, as in the example of the boat in which Galileo proves the law of inertia.