Comments by "" (@sirtra) on "Veritasium"
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@thoughtricity4296 By shifting the orthogonal plane and thereby making the pathway in one direction longer than the other it should make it possible to detect if there is a difference in speed based on the direction - not what the speed is but just if its different. Ie you rule it it or out.
Think of it like this, you're at home and you send a friend in a car to get a bottle of milk from the shops - you stay at home and time how long it takes them.
If they go there and back in a straight line, the distance there and back would be equal. Now lets say the speed limit on the way there is 90mph, and 10mph on the way back - this is the unknown variable though. Naturally going to the shop would be quicker than coming back, but since you have no idea when they got to the shop only the total trip time there is no way to determine if one direction is faster than the other... as they are traveling on the same plane there and back the distance in one direction is equal to the distance in the other and any gain or loss in one direction gets cancelled out in the other in theory. Running the test in reverse (ie start at the shop, deliver milk to home, then return to shop) merely creates an indistinguishable scenario, its essentially just re-ordering the sequence of the same journey.
If however they go straight to the shops, but on the way back they have to stop by grandmas house well then suddenly one direction becomes longer than the other (this is the triangle, A to B is to the shop, B to C is grandma, C to A is home). This breaks up the symmetry problem and whilst you still can't technically measure the speed (since you still dont know when they got to the shops or grandmas) i THINK it would be possible to determine if the direction of travel has any influence on speed by running the test in reverse (ie they stop by grandmas on the way there)
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