# 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 ?
I wasn't sure it was having any effect on my sleep inertia, but the act of chopping up fruits and vegetables certainly did.
And while my sleep inertia hasn't disappeared altogether, it's been cut down dramatically.
In addition, the cognitive impairments caused by both Zolpidem and sleep inertia may impact decision-making, including responding to situations like fire alarms and medical emergencies as well as caring for sick children or driving to a clinic or hospital, said Wright.
One possible solution to reducing falls of older people due to Zolpidem, other sleep medications or sleep inertia would be to install bedside commodes for those who frequently wake up in the night to void themselves, said Wright.
It can be seen that there is no evidence supporting the notion of sleep inertia on performance or fatigue.
1995) noted that even if one considers the possibility that sleep inertia may occur when naps are used in an operational setting, one must balance this concern against the overall improvements in performance gained from the nap itself.
Finally, when the first and last readings of the day were excluded to avoid these sleep inertia and anticipation effects, three rather different trends over the remainder of the waking day were found.
All three variables showed a pronounced sleep inertia effect and a rather small sleep anticipation effect (Fig.
However, most researchers agree that the temporary inconvenience of sleep inertia is more than made up for by improved and a buoyed mood.
The first three minutes after waking saw the worst sleep inertia errors in maths tests, he said.
motivation alone may be insufficient to overcome the effects of sleep inertia.

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