# inertia

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## inertia

(ĭnûr`shə), in physics, the resistance of a body to any alteration in its state of motionmotion,
the change of position of one body with respect to another. The rate of change is the speed of the body. If the direction of motion is also given, then the velocity of the body is determined; velocity is a vector quantity, having both magnitude and direction, while speed
, i.e., 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 property 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 states that the external force required to affect the motion of a body is proportional to that acceleration. The constant of proportionality is known as the massmass,
in physics, the quantity of matter in a body regardless of its volume or of any forces acting on it. The term should not be confused with weight, which is the measure of the force of gravity (see gravitation) acting on a body.
, 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.

## Inertia

That property of matter which manifests itself as a resistance to any change in the motion of a body. Thus when no external force is acting, a body at rest remains at rest and a body in motion continues moving in a straight line with a uniform speed (Newton's first law of motion). The mass of a body is a measure of its inertia. See Mass

## inertia

(i-ner -shă) The property of a body by which it resists change in its velocity. It is inertia that causes a body to continue in a state of rest or of uniform motion in a straight line (see Newton's laws of motion). The force required to give a specific acceleration to a body depends directly on its inertia. It is through the property of inertia that the concept of the mass of a body (its inertial mass) arises.

## Inertia

in mechanics, a property of material bodies that is reflected in the first and second laws of mechanics. When there are no external influences (forces) acting on a body or when they are mutually balanced, inertia is manifested in the fact that the body maintains unchanged its state of motion or rest with respect to the so-called inertial frame of reference. If, however, an unbalanced system of forces acts on the body, then the property of inertia is manifested in the fact that a change in the body’s state of rest or motion, that is, a change in the velocities of its points, takes place gradually and not instantaneously. Here, the greater the inertia of the body the more slowly the motion changes. The mass of a body is the measure of its inertia.

The term “inertia” is still used with respect to various instruments; the inertia of an instrument is its property of displaying readings with a certain delay.

S. M. TARG

## inertia

[i′nər·shə]
(mechanics)
That property of matter which manifests itself as a resistance to any change in the momentum of a body.
(medicine)
Sluggishness, especially of muscular activity.

## inertia

Physics
a. the tendency of a body to preserve its state of rest or uniform motion unless acted upon by an external force
b. an analogous property of other physical quantities that resist change
References in periodicals archive ?
In typical circumstances, therefore, the inertia of the occupant is much greater than the [I.
In spite of the fact that the inertia of the occupant dominates the reactance torque, changes in the rigid body yaw rotational inertia of the wheelchair assembly ([I.
Of these, the rigid body yaw rotational inertia of the occupant and the rigid body yaw rotational inertia of the wheelchair assembly are most significant, i.
A higher yaw moment of inertia requires a greater effort to initiate (or stop) turning motion.
Several studies offer insight into the magnitudes of different frictional and inertia factors.
The inertia of all matter in the universe is like a massive river of power and energy flowing from the present into the future.
RPM)/(308 x t), it takes 65 lb-ft to move the load inertia of 1 lb-[ft.
No matter how big the motor gets, it cannot provide the cyclic torque required at this rate of change of speed because it cannot even move its own inertia at that rate with no allowance for the load itself.
01 sec) over 200 rpm, will take a total torque to inertia ratio of at least 65.
There are significant barriers to accomplishing this with existing electric motors but modern brushless motors have sufficiently low inertia compared to their continuous and peak torque output to meet most of these requirements.

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