What is Inertia? - Navo

• Inertia is, in physics, the resistance of a body to any change in its state of motion, it is the resistance of a body at rest to being set in motion or of a body in motion to any change of speed or change in direction of motion. Inertia is a property common to all matter. This was first observed by Galileo and restated by Newton as his first law of motion, sometimes called the law of inertia. 

• Newton's second law of motion says that the external force required to affect the motion of a body is proportional to that acceleration. This, The constant of proportionality is known as the mass, which is the numerical value of the inertia; the greater the inertia of a body, the less is its acceleration for a given applied force. 

• In Inertia a moving objects means that an object that is moving in a straight line at constant speed will continue to move in the same direction and with the same speed unless an external force is applied to it.  

• The result of applying a force to an object in uniform motion, depending on the direction of the force applied, will be to change the speed, or direction of movement, or both. For Example, If a ball is still and you kicked it that is inertia and it is still moving that is Inertia. Inertia happens in everyday of your life.