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Force multiplier
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fourfathom:

--- Quote from: electrodacus on February 09, 2023, 03:06:41 pm ---You do realize that the vehicle needs to move in the opposite direction of applied force ?
--- End quote ---

"And yet it moves." 

It's amazing to watch how you twist yourself up in your pretzel logic.  But I suppose if your fundamental premise is wrong...
IanB:
It's especially strange after all the arguments that F2 is equal and opposite to F1, and yet suddenly when it comes to the direction of movement of the cart we have that F1 is the "applied force" and no mention of F2. If F1 and F2 are equal and opposite, why can't F2 be the applied force?
electrodacus:

--- Quote from: Nominal Animal on February 09, 2023, 04:09:28 pm ---
--- Quote from: electrodacus on February 09, 2023, 03:06:41 pm ---You do realize that the vehicle needs to move in the opposite direction of applied force ?

--- End quote ---
That's not what Newton's first law of motion says.

In other words, what you insinuate there, is utterly wrong: you're actually saying, "You do realize that incorrect assertion".  This is a really weird and awkward way to ask someone if they too misunderstand in the same way as yourself.  Odd.

--- End quote ---

That question may not be phrased great and it is taken out of question.

The treadmill moves to the left so it pushes the vehicle to the left by applying F1 at the right wheel.
The vehicle due to the way the wheels are connected will want to move to the right so in the opposite direction but it can not do that since F2 can not be larger than F1 this vehicle is stuck same as if it was all a single solid object.
This F2 = F1 is due to Newton's 3'rd law and without energy storage (belt stretched) and right wheel slip the vehicle could not move to the right thus against the direction of applied force F1

What I was trying to say is that no device can move against the direction of applied force unless it uses energy storage and stick slip hysteresis.
Not only I say that but it is clearly visible in the slow motion video I made.
electrodacus:

--- Quote from: IanB on February 09, 2023, 04:24:02 pm ---It's especially strange after all the arguments that F2 is equal and opposite to F1, and yet suddenly when it comes to the direction of movement of the cart we have that F1 is the "applied force" and no mention of F2. If F1 and F2 are equal and opposite, why can't F2 be the applied force?

--- End quote ---

This vehicle right wheel is the input wheel in the way it is setup.
It is not like when you apply F1 it takes some time until you get F2 they are a pair so at the same instant you have F1 you will also have the equal and opposite F2 so there is no delay.


See the image below that you normally find in a textbook when Newton's 3'rd law is explained
Will you say that F1 is at the human side as applied force and F2 is at the wall as equal and opposite ?
Can you imagine replacing that Newton force meter with some sort of gear box like what we have in case (a) and will that be able to change the ratio between F1 at human and F2 at the wall ?
Of course it will not be able to do that no matter what you replace that Newton meter with.

Kasper:
If you want to compare hydraulics to a boost smps, look at hydraulic ram pump.
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