Despite their embrace of the principle of rectilinear inertia and the recognition of the kinematical relativity of apparent motion ( which underlies whether the Ptolemaic or the Copernican system is correct ), natural philosophers of the seventeenth century continued to consider true motion and rest as physically separate descriptors of an individual body.

Inertial drum brake ascenders used in rock climbing and the inertia reels used in many automobile seat belts operate on the same principle.

There are speculative theories that claim inertia is produced by the combined mass of the universe ( e. g., Mach's principle ), which implies that the rest frame of the universe might be preferred by conventional measurements of natural law.

In general relativity, the principle of inertia is replaced with the principle of geodesic motion, whereby objects move in a way dictated by the curvature of spacetime.

This was then used to define the " quantity of motion " ( today called momentum ), and the principle of inertia in which mass replaces the previous Cartesian notion of intrinsic force.

Another mistake was his treatment of circular motion, but this was more fruitful in that it led others to identify circular motion as a problem raised by the principle of inertia.

Hooke clearly postulated mutual attractions between the Sun and planets, in a way that increased with nearness to the attracting body, along with a principle of linear inertia.

One of the best-known of Mach's ideas is the so-called " Mach principle ," concerning the physical origin of inertia.

* 1907 – Albert Einstein introduces the principle of equivalence of gravitation and inertia and uses it to predict the gravitational redshift

The principle is very similar to an alternator, except the rotor is usually kept spinning by its inertia ( having been " spun up " by an external motor, or the compulsator itself having been used in reverse as an AC motor ) and the small matter of the " compensation ".

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* Albert Einstein introduces the principle of equivalence of gravitation and inertia and uses it to predict the gravitational redshift.

A string trimmer works on the principle that a line that is turned fast enough is held out from its housing ( the rotating reel ) very stiffly by the string tension that exerts the centripetal force that prevents the string from flying off in a straight line under its own inertia.

Einstein partially advocates Mach's principle in that distant stars explain inertia because they provide the gravitational field against which acceleration and inertia occur.

However, this acceleration does not show up in the orbits of the outer planets, so any generic gravitational answer would need to violate the equivalence principle ( see modified inertia below ).

In the case of update, this principle formalizes the assumption of inertia.

In his memoir on the theory of the conjugate axis and of the moment of inertia of bodies he enumerated the principle now known as Binet's theorem.

It was derived by Einstein ( 1905 ) as a consequence of the relativity principle, that inertia of energy is actually represented by, but in contrast to Poincaré's 1900-paper, Einstein recognized that matter itself loses or gains mass during the emission or absorption.

It became the sole `` subject '' of `` international law '' ( a term which, it is pertinent to remember, was coined by Bentham ), a body of legal principle which by and large was made up of what Western nations could do in the world arena.

For better or for worse, we all now live in welfare states, the organizing principle of which is collective responsibility for individual well-being.

Whether a concept analogous to the principle of internal responsibility operates in a nation's external relations is less obvious and more difficult to establish.

) The concept of nationalism is the political principle that epitomizes and glorifies the territorial state as the characteristic type of socal structure.

Complementing the political principle of nationalism is the legal principle of sovereignty.

As Lipton puts it: `` The Eros is felt in the magic circle of marijuana with far greater force, as a unifying principle in human relationships, than at any other time except, perhaps, in the mutual metaphysical orgasms.

But Aristotle kept the principle of levels and even augmented it by describing in the Poetics what kinds of character and action must be imitated if the play is to be a vehicle of serious and important human truths.

So far as the existing body of formal principle and procedure is concerned, categorical novelties are not to be anticipated in Jewish-Gentile relationships ; ;

In conformance with the maximization principle we affirm that Gentile-Jewish relations will be harmonious or inharmonious to the degree that one relation or the other is expected by the active participants to yield the greatest net advantage, taking all value outcomes and effects into consideration.

Like ours, the economy of the space merchants must constantly expand in order to survive, and, like ours, it is based on the principle of `` ever increasing everybody's work and profits in the circle of consumption ''.

The principle is commendable but we suspect that in the practice somebody is going to get gulled.

In the United Nations Charter, the right of self-determination is also an essential principle.

Nonetheless, although few in number they are a stubborn crew, as tenacious of life as the Hardshell Baptists, which suggests that there is some kind of vital principle embodied in their faith.

What we will be sacrificing in any such arrangement will be our power to be selective which is contained in the reciprocal trade principle under which we now operate.

A second fundamental principle is that involved particularly in the present proceeding -- the difference between nighttime and daytime propagation conditions with respect to the standard broadcast frequencies.

In following this general principle, Mason provides the observer with a natural eye progression from foreground to background, and the illusion of depth is instantly created.

The principle of `` bills only '', or `` bills preferably '', seems so strongly accepted by the Federal Reserve that it is difficult to envision conditions which would persuade the authorities to depart radically from it by extending their open market purchases regularly into long-term Government securities.

In fact, some -- Anzilotti is the principle example -- went so far as to say that all international law could be traced to the single legal norm, Pacta sunt Servanda.

Obviously, the goal here proposed is the guiding principle in Mr. Justice Frankfurter's opinions -- to the extent that Congress leaves the problem to judicial discretion.

Mr. Justice Black no doubt concurs in principle but is more apt to make exceptions to achieve a generous and `` just '' result.

It is an accepted juridical principle in California that a Superior Court decision does not constitute a binding legal precedent.

Logically, then, the first principle of the plan must be that it is not rigidly oriented toward any geographical area.

Therefore the second principle of the plan must be that, while providing for all-out hostilities, its effectiveness is not dependent on general war.