Alteration of motion is momentum flow. If you object to the word "flow", that's why the third law is there. Whatever momentum is lost by one object is necessarily gained by another - it flows from one to the other any time a force is acting. I doubt Newton would dispute that. The issue is simply...
Is this a physics forum or an engineering forum? As stated in the OP, this is about the philosophy of mechanics. The change is of entirely no consequence when it comes to calculation. It's just a way of thinking about what you actually mean when you use the word "force". Do you say it "just is"...
It simplifies, not complicates.
Define momentum, posit that it is conserved, and that's all you need. Newton's laws become 1) stating the obvious, 2) a redundant definition and 3) stating the obvious.
Where it doesn't seem to help, just substitute the word "force" where you see "flow of...
Lovely -- I started to draft a reply but got bogged down in detail. You've said it in a nutshell.
Balanced forces are balanced momentum flows. As with flows of mass or charge, you can have flows occurring without any net accumulation or depletion in any body.
As for the strain - it's...
Hello,
I am hoping for some input concerning shall we say the philosophy of mechanics, particularly with relation to the concept of force.
Most textbooks treat force as being something of a primary concept. A fundamental aspect of nature much like energy and mass and therefore something...
Bang, I think you have hit the nail on the head of what got me thinking about this in the first place.
The idea of "acceleration" is now radically different to the classical concept. It's not a kinematic concept at all... nothing to do with a nonzero second derivative of displacement with...
Purpose of the "closed box"
It's often stated that GR follows from the observation that an experimenter inside a closed box in freefall could not distinguish between the box being in that circumstance, and the box being in open space away from any gravitational field. In each case, objects...
OK, I *think* the other half of the story is the flow control throttle.
What I'm wondering about is the claim that the throttle slide valve "reduces flow" (drops pressure) without creating turbulence.
How is this actually achieved at the particle level? The lost energy must go into the...
FWIW I have nutted out half of the answer.
They do maintain a constant pressure across the nozzle, by adjusting the outlet effective aperture and relying on upstream friction losses to reduce pressure as flow rate increases. Effectively it maximises flow rate for the system and pump pressure...
How do "automatic" fire hose nozzles work?
I'm hoping someone can explain to me how "automatic" fire hose nozzles work. As in TFTs (Task Force Tips). I have a background in physics and since becoming a volunteer firefighter for my own interest have been working through some of the physics...