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Mess with your minds: A wind powered craft going faster than a tail wind speed.

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electrodacus:

--- Quote from: Alex Eisenhut on September 03, 2021, 03:58:07 pm ---Question: Do you agree with the red arrows I added to your diagram?

(And JFC if someone could explain to me how the #%$#%$!! you get attachments to show up properly!!)

(Attachment Link)

--- End quote ---

Yes I agree with your red arrows but what is the point for that ?
The attachments appear as they should. You are probably asking why they are not the same as the ones I post and that is because I do not use attachments I insert a photo that is linked to my website so it shows as an inserted image at full size not as a small attachment icon. 

Alex Eisenhut:
Excellent. How can the G wheel "see" or be influenced by the force/movement/energy/power indicated by the red arrows?

electrodacus:

--- Quote from: bdunham7 on September 03, 2021, 03:57:12 pm ---
--- Quote from: electrodacus on September 03, 2021, 03:51:58 pm ---You asked about power not energy and that was the wrong thing to ask for as power is not the same with energy.
To answer the power question you will need to know much more about the vehicle shape and construction and you will also need to know at what exact moment you needed to know the power.

--- End quote ---

OK, a point for you.  I meant energy, and my followup is clear enough--are you saying the wall provides 9Ws of energy to stop the car or did you mean something else?

--- End quote ---

I did not meant something else wall needed to be able to absorb the 9Ws else it will no longer be called a wall after the impact.

But what about my other replays where I say power in and out of the system is a better/simpler way to predict if vehicle will slow down or accelerate. Looking at the balance of forces is not useful as those are forces at the wheel / propeller not the forces acting against the vehicle since vehicle is between two isolated mediums that have different speeds.

electrodacus:

--- Quote from: Alex Eisenhut on September 03, 2021, 04:09:02 pm ---Excellent. How can the G wheel "see" or be influenced by the force/movement/energy/power indicated by the red arrows?

--- End quote ---

Not quite sure you know what you are asking.  Do you notice the two larger black triangles ? Those fix the treadmill to the ground and there will be forces acting against those when vehicle is pushed down from the treadmill.  I guess you can make an analogy with how pulleys work.
The important part is that treadmill is not moving relative to the ground.  If you turn off the treadmill rotation and push the treadmill then it will move relative to the ground and then you can reverse that movement and say that ground moves relative to the treadmill. So it is not the same thing.

cbutlera:

--- Quote from: electrodacus on September 03, 2021, 03:44:53 pm ---You say since there is higher force it means vehicle will accelerate in a certain direction when that is wrong as the force you refer to is force acting against the propeller or against the wheel not against the body of the vehicle.
Force at the wheel is not the same with force on the body when the wheels are acting against two isolated mediums.

--- End quote ---

So you are saying that the rate of change of momentum of a body over time is not just proportional to the net external force.  It also depends on what that force or those forces are acting against.

Are there any of Newton's laws that you agree with?

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