By Roger Chesneau
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Additional resources for Aeroguide 22 - General Dynamics F-111 E/ F
In contrast to the inertial mass, the gravitational mass does not measure a resistance to the action of a force but rather represents itself the origin and source of a force, that of gravitational attraction, which, according to Newton’s law of gravitation, is proportional to the product of two gravitational masses attracting each other and being inversely proportional to the square of their distance. 24 But in spite of the very different conceptual function of the two kinds of masses in Newtonian mechanics, they turn out to be exactly proportional to each other and can thus be considered identical (in the following we will therefore simply 22 See (Lange 1883, 1885a, 1885b, 1886).
As the aether is a medium with concrete physical properties, the motion of a body with respect to this aether frame should somehow have noticeable effects. Now, if that is indeed the case, the aether model cannot be compatible with the principle of relativity of classical mechanics, according to which physical laws should be the same in two laboratories representing inertial frames and which are moving with rectilinear and uniform motion with respect to each other. Since the aether model entails that the speed of light with respect to the aether must always be the same, independently of the state of motion of the body emitting the light, such a violation of the relativity principle turns out to be an unavoidable consequence of this model.
This model is still rooted in intuitive physics, as is suggested by the anthropomorphic concept of force involved in it and also by its character as a modiﬁcation of the motion-implies-force model, from which it results by the speciﬁcation that it is not motion but acceleration that is caused by a force. But clearly the acceleration-implies-force model is actually no longer part of intuitive physics or of practitioners’ knowledge, as is made evident by its counter-intuitive consequences such as the implication that a force-free motion will never come to rest.