I am new to this forum and in line with its rules I am trying not to repeat a question already asked. I find that Jeremyfiennes original question I.ejeremyfiennes said:What is the best recent experimental evidence for effective mass increase (momentum/velocity) with speed, with experimental details? Searching the web all I find is either very old ones (early 1900s). Or vague generalized statements like (Wikipedia) "Many additional experiments concerning the relativistic energy–momentum relation have been conducted, including measurements of the deflection of electrons, all of them confirming special relativity to high precision." Thanks.
Experimental evidence for effective mass increasing with speed”
is the question I want to ask but I am not satisfied with the answers given so far.
I note the Bertozzi experiment and accept it is a cogent demonstration that bodies cannot be made to accelerate to the speed of light and beyond, but what interests me the most is why. In the past, textbooks have suggested that as the kinetic energy of a body increases so does its mass( mass as Newton would think of it) and there reaches a threshold where the increase in mass cancels out the energy input as it approaches c.
However, I also note that in recent years the concept of relativistic mass has become rather unfashionable. Many physicists dispute that a body’s mass increases as its kinectic energy gets greater. So who’s right? Surely using a particle accelerator to make a particle travel at, for example,1/2c( easily doable) one could tell experimentally from the way that particle interacts with other particles whether its rest mass has increased or not.
Perhaps by analyzing the conservation of momentum or by how much damage the interaction between particles causes.( A freight train traveling at the same speed as a fly will have a greater impact because it is more massive).
I hope I am making clear what I am looking for. Surely there is an experimental way to determine whether a body traveling at relativistic speeds does have significantly more mass than a body at rest. If such experiments were carried out what were their results
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