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Old Jan 10th 2018, 12:29 PM   #1
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Inertial force depends on mass in general relativity as well as classical mechanics.

PMB can you explain your analysis as to why you said that inertial force does not depend on mass. Einstein mentions that spacetime warps around massive objects and the more heavy an object is the more spacetime is warped meaning more gravity.

Now even though gravity depends on mass in general relativity as per the above analysis it is not a force because objects simply travel on the straightest possible paths through spacetime, called geodesics. The paths only seem curved because of the warping of spacetime.

So it doesn't take any force to keep something moving on a straight line. Which means that gravity is not a force.

I am eager to know the reason why you said gravity or more precisely inertial forces dont depend on mass.

Last edited by avito009; Jan 10th 2018 at 12:57 PM.
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Old Jan 10th 2018, 11:49 PM   #2
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My Mistake.

Sorry PMB I made a mistake what you meant was that acceleration was independent of mass in the equation F=ma but I misinterpreted it as force is independent of mass due to which in my earlier thread I made a mistake.

In fact it is true that gravity depends on mass in both general relativity as well as classical mechanics. Einstein observed the equation for fictitious forces F=ma which says such a force is proportional to mass. So Einstein reasoned that this is true in case of gravity as well because gravity also depends on mass as per the reasoning in the earlier post of mine. So since gravity depends on mass it must be a fictitious force.

But when i searched on google i read somewhere that fictitious forces depend only on acceleration but later was unable to find the article. Big mistake from my side. But remember we develop intelligence when we get wrong answer not when we get right answer.
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