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| Mess with your minds: A wind powered craft going faster than a tail wind speed. |
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| fourfathom:
Here's a demonstration I like (most have probably already seen it), and it's pretty similar to the moving paper test. In this one the upper board represents the wind, and the floor represents the ground, so there's no reference frame issue. And there's no energy storage, and it can continue, faster than the "wind", forever. (It's in Veritasium's "A Physics Prof Bet Me $10,000 I'm Wrong" video where he has his "roller" demonstration) I can't get the embedded video to start at the right time, so skip ahead to 13:34 |
| electrodacus:
--- Quote from: fourfathom on September 19, 2021, 12:02:08 am ---Here's a demonstration I like (most have probably already seen it), and it's pretty similar to the moving paper test. In this one the upper board represents the wind, and the floor represents the ground, so there's no reference frame issue. And there's no energy storage, and it can continue, faster than the "wind", forever. --- End quote --- That demonstration is wrongly interpreted. The floor is the wind and the vehicle travels on the moving lumber. Small wheels are the generator wheels and the large wheel is the motor wheel. Please look closer to understand how that works. So what is shown there is a vehicle traveling at about 2.8x lower speed on the lumber (road) powered by the floor (wind) in the opposite direction. |
| Psi:
I don't think it really matters if the wood is the wind or the floor is the wind. The important factor is that two forces together can move the object faster than either of them are moving. It's the best demonstration of how this can be possible that i have seen so far. |
| Brumby:
--- Quote from: electrodacus on September 18, 2021, 08:50:07 pm ---1. Sorry but how can you say there is no energy storage when is so clear seen in video and is clear to see the stretching of the rubber belt. --- End quote --- Here is a classic example of YOU not understanding physics. The jerkiness of motion as seen in your video is the direct cause of friction in your system. You are taking a practical experiment - with all its flaws - and creating a theoretical model based on a completely wrong interpretation. Remove the friction and it will run smoothly. Use an inelastic chain and it will run smoothly, too. In the ideal scenario, there is NO energy storage, just energy transfer. Your demonstration is nowhere near ideal. You are only compounding the lack of understanding you have in physics. You are making it very clear that you are either a troll or the epitome of Dunning-Kruger. |
| electrodacus:
--- Quote from: Psi on September 19, 2021, 01:39:56 am ---I don't think it really matters if the wood is the wind or the floor is the wind. The important factor is that two forces together can move the object faster than either of them are moving. It's the best demonstration of how this can be possible that i have seen so far. --- End quote --- It maters what is the input and what is the output. Is like looking at the gear box input and output power and saying if you look from this side efficiency is 90% but if you look from this other side is over 100% Do you understand what I'm trying to say ? It is very important to know that the input and outputs are so in that case input is the floor (wind equivalent) and the output is the vehicle moves using the large wheel on the lumber. This is the only correct interpretation and you can not invert them and ignore that reference frame change as you get to wrong conclusions. |
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