| General > General Technical Chat |
| Newton's third law problem. |
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| Alex Eisenhut:
--- Quote from: electrodacus on November 24, 2022, 05:22:32 pm ---Thanks for taking the time to replay. --- End quote --- Sorry, but: |
| electrodacus:
--- Quote from: IanB on November 25, 2022, 02:45:58 am --- Having F1 equal to F2 is not relevant to how the vehicle will move. Forces are useful in static analysis problems. They do not help with kinematic problems like this one. The vehicle will move in accordance with how all the parts are connected. It is pure geometry. Unless you think the real world does not obey geometric constraints? --- End quote --- :) OK so you understood the floating gearbox problem. Static analysis is the important part here. Vehicle is stationary to start so you need a higher F2 if you want to accelerate the vehicle to the right. What helps you have a higher F2 is both energy storage in the rubber belt and stick slip hysteresis as shown clearly in the slow motion video. |
| electrodacus:
--- Quote from: Alex Eisenhut on November 25, 2022, 03:22:40 am --- Sorry, but: --- End quote --- Thanks for the correction. I'm sure you can find way more than that if you search. |
| electrodacus:
--- Quote from: IanB on November 25, 2022, 02:42:57 am ---In the very previous post we had the point where it is not floating. It is sitting on the ground. --- End quote --- Can you be more specific ? Where there 3 points of contact for the gearbox ? --- Quote from: IanB on November 25, 2022, 02:42:57 am ---Then you need to enlarge your understanding of how gears work. --- End quote --- Like I mentioned a gearbox with floating body is not actually a gearbox. --- Quote from: IanB on November 25, 2022, 02:42:57 am ---Yes, this is exactly the example to think about. Suppose the force between the handles is 10 N. What is the force (tension) on the tape? --- End quote --- Force at the tape is irrelevant as that represents the belt and the only points making contacts are the two handles one is the input the other the output with the floating body and non relevant internal mechanism because the body is floating. |
| electrodacus:
--- Quote from: fourfathom on November 25, 2022, 02:41:50 am --- --- Quote from: electrodacus on November 25, 2022, 02:35:39 am ---All usable gearboxes have 3 points of contact. --- End quote --- 1) Input : Ground 2) Output: Propeller / Air 3) Body: Chassis --- End quote --- What vehicle are you referring here ? I'm going to guess the direct downwind version. Yes input wheel is in contact with ground and the propeller is the output but the body of the gearbox is floating even if it just happens that the body of the gearbox can also be called the body. The problem is that input is not between the body and the wheels. There is no internal engine or motor witch will be connected with the stator to body and rotor to gearbox input. |
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