What experiment proves that an object gains mass as it accelerates?

This can be proven by collision and accelerating hadrons or leptons.


The first confirmation came in 1908, measuring the mass of fast electrons in a vacuum tube. In fact, the electrons in a color TV tube are about half a percent heavier than electrons at rest, and this must be allowed for in calculating the magnetic fields used to guide them to the screen.


Much more dramatically, in modern particle accelerators very powerful electric fields are used to accelerate electrons, protons and other particles. It is found in practice that these particles become heavier and heavier as the speed of light is approached, and hence need greater and greater forces for further acceleration. Consequently, the speed of light is a natural absolute speed limit. Particles are accelerated to speeds where their mass is thousands of times greater than their mass measured at rest, usually called the ';rest mass';.





Basically, if f= ma in basic physics then force to produce a certain acceleration of an object must remain constant; however, as the certain objects increase in speed to approach light (usuallu 1/2 c) more force is needed to produce the same acceleration. thus, the mass must increase for the classical equation to balance out.





thus, objects gain mass as they accelerate.What experiment proves that an object gains mass as it accelerates?
To answer the second part of your Q:


e=mc2


therefore the extra mass comes from the energy that is exerted on it.


After all isn't everything energy


even mass itself.





Even the acceleration and increased speed is, in one interpretation the enrgy.What experiment proves that an object gains mass as it accelerates?
theory of relativity
Watching my ex-mother-in-law eat.