149 reputation
9
bio website
location Australia
age 28
visits member for 3 years, 1 month
seen Mar 31 at 3:03

iPhone/iPad developer by day - gym nut by night.

Current strength:

  • Deadlift 250kg (551lb)
  • Squat 200kg (440lb)
  • Bench 140kg (308lb)

@ 82.5kg (181lb) 9% fat


Mar
28
accepted Why is centrifugal 'force' perpendicular to line of inertia
Mar
7
comment Why is centrifugal 'force' perpendicular to line of inertia
@aksakai I get that you are assuming that the obvious is in deed obvious. I know that the centrifugal 'force' pulling the rope taut is manifested because its getting a constant course correction from the curve of the orbit. The tangent line is the closest extrapolation of a straight line from the curve so thats where you'd expect the inertia to propagate? Why is it then 90 degrees? Why does there seem to be zero inertia along the tangent line when that is the direction it is moving at any moment?
Mar
7
asked Why is centrifugal 'force' perpendicular to line of inertia
Mar
5
revised Equal and opposite reaction - forces coming in pairs - or just common sense?
deleted 269 characters in body
Mar
4
comment Equal and opposite reaction - forces coming in pairs - or just common sense?
I'm saying either inertia or the "action/reaction" law must be fictitious unless they can be exhibited to not simply be an extrapolation of the other. To me its fictitiousness is inescapable within the very structure of the wording. An object's intension to collide with another obviously has no effect on the nature of the collision. A post collides with a car as much as a car collides with a post. Therefore, the phrases "equal/opposite" "action/reaction" call for an observer bias as to which is the originating action. Extract observer bias from the phrase and you aren't left with any words.
Mar
4
comment Equal and opposite reaction - forces coming in pairs - or just common sense?
Please see our discussion below @garyp
Mar
4
comment Equal and opposite reaction - forces coming in pairs - or just common sense?
How do you know that it doesn't account for the reaction force? How would one construct an experiment to verify that it is separate to the inertia of the objects in the system? To my way of thinking the reaction force is as fictitious as centrifugal force is.
Mar
4
comment Equal and opposite reaction - forces coming in pairs - or just common sense?
my proposition is that the object's resistance to a change in momentum (its inertia - which is tied to its mass) is what causes you to be forced backwards if you were to (as an example) push off of the International Space Station when doing a space walk. Why must we say that it is a mysterious counter force that the universe decides to propagate "just because" when the properties of inertia could probably explain this? There are theories about how inertia could actually be an emerging property from space-time distortion.
Mar
4
comment Equal and opposite reaction - forces coming in pairs - or just common sense?
You'd only go backwards because the box resists a change in it's acceleration to a point directly proportional to its mass? If the box theoretically had zero mass you wouldn't go anywhere.
Mar
4
comment Equal and opposite reaction - forces coming in pairs - or just common sense?
Yes and also meaningless is telling kids in school that when you push on something it will push back at you. Well no, it doesn't push back at you it merely exhibits inertia and resistance to a change in acceleration right?
Mar
4
comment Equal and opposite reaction - forces coming in pairs - or just common sense?
Hmm.. just another quick question; if a person pushes on a box why do they talk about the box responding with the same force back? Isn't the box just exhibiting its mass and therefore its resistance to a change in acceleration (as well as any friction forces)?
Mar
3
comment Equal and opposite reaction - forces coming in pairs - or just common sense?
Yep you've helped me understand this concept more intuitively so thank you!
Mar
3
comment Equal and opposite reaction - forces coming in pairs - or just common sense?
Yes I get what you're saying. There is no splitting - that makes complete sense. I edited my answer as you were writing this…does my last idea make sense?
Mar
3
revised Equal and opposite reaction - forces coming in pairs - or just common sense?
added 434 characters in body
Mar
3
asked Equal and opposite reaction - forces coming in pairs - or just common sense?
Feb
28
asked twin paradox inferring cosmic speed limit
Feb
28
awarded  Commentator
Feb
28
accepted is centrifugal release equal to explosive release
Feb
28
comment is centrifugal release equal to explosive release
Same with stepping off a boat. You push against the boat and the mass differential between your body and the boat as well as the friction in the water enables you to jump off the boat onto the ground without falling on your face. The boat comparatively moves in the opposite direction minimally, but not because of some weird law, simply because you pushed it back!
Feb
28
accepted Is Einstein's Special Relativity completely inclusive of Newton's 3 laws of motion?