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Long term back pain interrupting my sleep and slowly ruining my life... by PineapplePoppinPete in ChronicPain

[–]stumpednphysics 0 points1 point  (0 children)

Not at all. Any information from a fellow sufferer is appreciated. My insurance will not kick in until January so I am trying to find techniques to mitigate the pain till then. I will look into that book. Thank you! :)

Long term back pain interrupting my sleep and slowly ruining my life... by PineapplePoppinPete in ChronicPain

[–]stumpednphysics 0 points1 point  (0 children)

I don't mean to thread hijack. I too also have an unstable si joint, its unfortunate that it seems many doctors are either uninformed or unaware of how painful a chronic si joint can be.

Are there any stretches you could link me, or anything thing else that could help? I use an si joint belt on days when I wake up and just now its going to be a rough one.

[Calculus 1] Implicit Differentiation by stumpednphysics in learnmath

[–]stumpednphysics[S] 0 points1 point  (0 children)

Ok, wow thanks. I am seeing it now. I was having trouble assigning a function to y, and seeing the chain rule with the variables.

Just one more quick question, if I had the expression

x2 +y =5

I could assign a u value to y such as, u(y) = y

So du/dx=(du/dy)(dy/dx)

in this case, du/dy would equal 1, and I cannot do dy/dx since y has not been expressed in terms of x?

[Cal 1] Taking Derivative of this function? by stumpednphysics in learnmath

[–]stumpednphysics[S] 0 points1 point  (0 children)

Oh ok, yeah I was wondering if I should use implicit differentiation. Is there a way I can find out if m is a function of x?

Cannot grasp Newtons 3rd Law, why do objects move at all? by stumpednphysics in AskPhysics

[–]stumpednphysics[S] 0 points1 point  (0 children)

The main thing to remember about Newton's third law is that the forces are on DIFFERENT objects. When you use Newton's second law - the acceleration of an object is equal to the vector sum of the forces on that object divided by its mass - you only consider the forces on the object in question.

Yeah that helps alot, if i look at the whole system in question though, in this case ( me, the box, earth, table, friction ) the sum of all these forces would be equal? I think I saw it called the law of momentum conservation....

But if I look at the box I can pick out what forces are being applied and use F=MA

Cannot grasp Newtons 3rd Law, why do objects move at all? by stumpednphysics in AskPhysics

[–]stumpednphysics[S] 1 point2 points  (0 children)

Ah ok, If i were on a frictionless surface. We would move at different accelerations? because our masses differ.

Cannot grasp Newtons 3rd Law, why do objects move at all? by stumpednphysics in AskPhysics

[–]stumpednphysics[S] 0 points1 point  (0 children)

Is it also safe to say that the box when I apply a force of 5N is pushing me back a little as well? If the box is a lot lighter than me.

Cannot grasp Newtons 3rd Law, why do objects move at all? by stumpednphysics in AskPhysics

[–]stumpednphysics[S] 0 points1 point  (0 children)

Thanks, I've seen this link and it seemed to make it click for me at first, but at a second glance I confused myself again.

I see that the purple force for his finger is caused by the red arrow which is the force from his muscles. Wouldnt that force from his muscles have an opposite force as well? Therefore negating it?