# Relationship of mass and inertia

### kinematics - Inertia Vs Momentum - Physics Stack Exchange

Mass and inertia are directly related but mass is not equal to inertia. Newton's First Law of Motion: Inertia. Explain with the help of examples. Answer: The mass of a body is a measure of its inertia. It means larger the mass of a body, larger will be the. It has been said that mass is a measurement of inertia. We can illustrate this mathematically using force, momentum, and even energy. Momentum describes .

It has no magnitude or measurement units. To quantify Inertia, physicists developed the more specific concept of Momentum, which has quantities of mass, speed, and direction. Inertia is the observed natural tendency of an object in motion to keep moving in the same direction and at the same speed, or if at rest, to stay at rest.

In physics, we quickly learn the the only difference between an object moving or being at rest is the relative motion of the observer, so both of these cases are really the same thing.

## State the relationship between mass and inertia

Inertia simply tells us that to change the motion of an object requires applying a force to it. To fully describe the property of Inertia with units we can measure, we must quantify an object's speed of motion, direction of motion, and resistance to change of motion. We combine these three things into a single parameter for each object called its Momentum.

The resistance to change of motion does not depend upon direction, so it is what we call a "scalar" quantity, and has been named Mass. We quantify Mass using units such as kg or lb-mass. Objects that require a lot of Force to accelerate a little bit have large Mass.

Objects that accelerate a lot with a little bit of Force have small Mass. Speed is also a scalar quantity, but when we combine speed with direction, we get a "vector" quantity called Velocity.

Or at least to the end of the table top. A force is not required to keep a moving book in motion. In actuality, it is a force that brings the book to rest.

## What is the Relationship Between Mass and Inertia

Mass as a Measure of the Amount of Inertia All objects resist changes in their state of motion. All objects have this tendency - they have inertia. But do some objects have more of a tendency to resist changes than others?

The tendency of an object to resist changes in its state of motion varies with mass. Mass is that quantity that is solely dependent upon the inertia of an object.

The more inertia that an object has, the more mass that it has.

A more massive object has a greater tendency to resist changes in its state of motion. Suppose that there are two seemingly identical bricks at rest on the physics lecture table. Yet one brick consists of mortar and the other brick consists of Styrofoam.