| General > General Technical Chat |
| Mess with your minds: A wind powered craft going faster than a tail wind speed. |
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| Alex Eisenhut:
OK here we go. Would you agree that the Canadian Shield is a sufficiently large and massive surface to consider as "stationary" for our purposes? |
| electrodacus:
--- Quote from: IanB on September 02, 2021, 05:42:57 pm --- The top of the treadmill is a flat surface moving from right to left under the front wheels of the cart, relative to a stationary surface on which the back wheels rest. The piece of paper is a flat surface moving from right to left under the front wheels of the cart, relative to a stationary surface on which the back wheels rest. Explain where is the difference between these two cases? --- End quote --- Have you even read my entire post ? That post already explains what happens. In this vehicle diagram the treadmill is the road and the ground/table is the wind. We considering that wind speed and vehicle speed are the same thus they are both stationary at the start of the experiment. Can you not see the problem when you have the treadmill running at 2m/s and it is also pushed at 2m/s that case b) If you where to move the ground/table representing the wind from left to right at 2m/s it will be the same thing but maybe now is more visible for you why treadmill is different from dragged paper. Case a) and case c) are not at all the same and quite the opposite. You can imagine keeping the paper fixed and moving the table from left to right then it may be more visible for you. |
| Alex Eisenhut:
--- Quote from: electrodacus on September 02, 2021, 05:56:11 pm --- Can you not see the problem when you have the treadmill running at 2m/s and it is also pushed at 2m/s that case b) --- End quote --- Wait... you think the entire treadmill moves too? Maybe English isn't your native language, please be more precise. What is being "also" pushed here? Do you understand that the treadmill doesn't move? Like in a gym? It's only the belt? The belt is the black thing that people stand on. |
| electrodacus:
--- Quote from: Alex Eisenhut on September 02, 2021, 06:00:15 pm ---Wait... you think the entire treadmill moves too? Maybe English isn't your native language, please be more precise. What is being "also" pushed here? Do you understand that the treadmill doesn't move? Like in a gym? It's only the belt? The belt is the black thing that people stand on. --- End quote --- Yes what your paper represent is case c) a powered off treadmill pushed relative to the ground. The case b) is my way to show an intermediary state so that you get the fact that a treadmill is not at all the same as a pushed paper. I understand that treadmill doesn't move you are the ones that does not understand that. |
| IanB:
--- Quote from: electrodacus on September 02, 2021, 05:56:11 pm --- --- Quote from: IanB on September 02, 2021, 05:42:57 pm --- The top of the treadmill is a flat surface moving from right to left under the front wheels of the cart, relative to a stationary surface on which the back wheels rest. The piece of paper is a flat surface moving from right to left under the front wheels of the cart, relative to a stationary surface on which the back wheels rest. Explain where is the difference between these two cases? --- End quote --- Have you even read my entire post ? That post already explains what happens. --- End quote --- No. Do not go off on a tangent. Do not start introducing other topics. Compare my two sentences. Explain what is the difference between those two scenarios? |
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