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Updated: May 7, 2025
Justification thereby seemed to be given for the building of a valid scientific world-picture, purely kinematic in character.
Instead of the parallelogram of forces following from the parallelogram of movements, and the entire science of dynamics from that of kinematics, our very faculty of thinking in kinematic concepts is the evolutionary product of our previously acquired intuitive experience of the dynamic order of the world.
Even though this too may have first been learnt through outer observation, yet it remains true that for the discovery of the fact expressed by it valid for all plane triangles no outer experience is needed. So in the theorem of the Parallelogram of Velocities we have a strictly geometrical theorem, whose content is in the narrowest sense kinematic.
Imagine a young dancer and the admitted age for ritual dancing was commonly from about eighteen to thirty coming forward on the dancing-ground or platform for the INVOCATION OF RAIN. We have unfortunately no kinematic records, but it is not impossible or very difficult to imagine the various gestures and movements which might be considered appropriate to such a rite in different localities or among different peoples.
Kinetics is applied kinematics, or, as pointed out above, dynamics treated with kinematic concepts. 5 These last statements will find further illustration in the next two chapters. 6 First published in 1917 in his book Von Seelenrätseln.
The above statement, like others of Eddington's, has been Contested from the side of professional philosophy as logically untenable. Our own further discussion will show that it accords with the facts. 4 Both words, kinematics and kinetics, are derivatives of the Greek word kinein, to move. The term 'kinematic' is used when motion is considered abstractly without reference to force or mass.
In forming his picture of the universe, it is true, Copernicus was concerned with nothing but the spatial movements of the luminous entities discernible in the sky, without any regard to their actual nature and dynamic interrelationships. Hence his world-picture as befits the spectator-form of human consciousness which was coming to birth in his own time is a purely kinematic one.
Taking the last-named fact first, we shall make use of the following comparison to help us realize how little we are justified in drawing from observations of the front speed of a light-beam any conclusions concerning the kinematic conditions prevailing in the interior of the beam itself.
Spatial distances and lengths of time are measured and the results compared. Nothing, for instance, is said about the dynamic cause of the movements. The assertion is restricted and this is true also of the first and second law to a purely kinematic content, and so precisely to what the earthly onlooker can apprehend.
For they are all purely kinematic concepts typical of the onlooker-way of conceiving things concepts, that is, to which nothing corresponds in the realm of the actual phenomena. Our next task, therefore, will be, where possible, to fill these concepts with new meaning, or else to replace them by other concepts read from the actual phenomena.
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