# What is inertia ?

word "inertia" we associate with physics, but we often use it in everyday life regardless of this science.Let's see, what is inertia.

## meaning of

This word comes to us from Latin: inertia.Inertia means "inaction".

Inertia - a property of the body to maintain the original state of rest or uniform motion, when he was no force (the cart rolled by inertia).

The word is also used in a figurative sense: the inertia refers to the lack of initiative, inactivity.In this regard, the people spread the phrase "to do something out of inertia" or "live by inertia," which means to perform some action out of habit, without any special effort.It is synonymous with the expression "go with the flow."

also there adjective "inert".He, as you may have guessed, you can replace the word "inactive".

## inertia in Newton's law

famous physicist Isaac Newton proclaimed the existence of inertial reference systems, ie those for which the moving body remain constant velocity if they are not subject to other bodies or the action of other bodies is compensated.This is known as Newton's first law.It is also called the law of inertia, since this phenomenon save the speed of rectilinear uniform motion (or rest) of the body and is called inertia.

There are other reference systems, but all of them, whatever - moving or rotating with acceleration - will be referred to non-inertial.

not to say that Newton was a pioneer in this matter, since it was based on the works of Galileo, who first expressed by the statement that, if the body is not another force acts, it does not mean that it is at rest.On the contrary, the state of uniform motion is like a natural body, and the rest - it is rather a special case of such a movement, which is equal to zero speed.The very uniform and rectilinear motion of free body and called inertial motion.

### inertial force

In physics, there is also such a thing as the power of inertia.This term is widely applicable in mechanics.This concept applies to Dalamberovoy, Euler, Newton's forces.

Also, you can be useful the following articles:

• Laws speakers |The law of inertia
• What is the stopping distance

## Example use of the word

"Centrifugal force spins the acceleration of your body, and progressive forward momentum geometrically increases impact strength."(Alex Yashkin. Karate for women).