awaterpon 0 Posted July 11, 2019 My first thread about this topic: F=GmM/r²This equation is not valid and wrong.What is wrong with this equation?Mathematics equations are a away to measure quantities related to other quantities .Equations works for finite values, I measure r = 4 meters and find out F to be x NewtonsEquations won't work for infinite values , that is equations themselves works finitely but not infinitely .Let say F decreases without bound while r increases without bound, then the equation itself as a functional tool will approach infinity and the equation limit as r approaches ∞ is ∞, the equation is undefined and wrong.If the equation definition is the tool that finds values of F for each value of r, then I can't find all values of F for all values of r , then the equation won't work for all values of F and r and it is useless and invalid.That means the equation itself approaches ∞ in measuring the quantities and undefined I can say at F=0 , r doesn't exist and equals ∞, so the equation won't work and undefined in such case and invalid, but some scientists might say F won't reach 0 ever , so I presented the explanation above. 0 Share this post Link to post Share on other sites

Bufofrog 87 Posted July 11, 2019 Since infinity is not a number this is no problem. Any number you put in for R will result in a valid result. Since infinity is a concept it is not surprising that substituting a concept for a number will result in an invalid result. Glad we cleared that up! 0 Share this post Link to post Share on other sites

Strange 4242 Posted July 11, 2019 ! Moderator Note You were warned. Closed pending moderator discussion. On 5/6/2019 at 10:53 AM, swansont said: Moderator Note Do not bring up any other models of gravity. You've demonstrated that you are not willing/able to discuss science with enough rigor to make it worthwhile. 0 Share this post Link to post Share on other sites

Strange 4242 Posted July 11, 2019 ! Moderator Note @awaterpon The problem you see here is nothing to do with gravity, it is a general problem in many equations. If you want to understand how mathematics (and therefore physics) handles equations that can lead to infinities, then I suggest you read up on the concept of "limits" and how to determine (using calculus) how an equation behaves as values approach infinity. If you want to start a thread on this (in the Mathematics forum) then do so, but stick to asking questions (and not claiming things are wrong when they obviously are not). 0 Share this post Link to post Share on other sites

swansont 7238 Posted July 11, 2019 2 hours ago, awaterpon said: I can say at F=0 , r doesn't exist and equals ∞, so the equation won't work and undefined in such case and invalid, but some scientists might say F won't reach 0 ever , so I presented the explanation above. ! Moderator Note Dependent and independent variables seems to be another thing to discuss, in addition to limits that Strange has mentioned. 0 Share this post Link to post Share on other sites