Editing Talk:2413: Pulsar Analogy
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:::Of course, on a frictionless surface there's some slow retrograde rotation of the case + extended tape that speeds up as the tape retracts, but the case should completely stop spinning once the tape is fully retracted in that scenario, which is opposite of the analogy being drawn. [[Special:Contributions/172.69.34.12|172.69.34.12]] 02:43, 19 January 2021 (UTC) | :::Of course, on a frictionless surface there's some slow retrograde rotation of the case + extended tape that speeds up as the tape retracts, but the case should completely stop spinning once the tape is fully retracted in that scenario, which is opposite of the analogy being drawn. [[Special:Contributions/172.69.34.12|172.69.34.12]] 02:43, 19 January 2021 (UTC) | ||
::::On a frictionless surface, it would ''never'' stop spinning. Once the case starts to spin, there's nothing to slow it down. --[[Special:Contributions/172.69.63.183|172.69.63.183]] 17:45, 19 January 2021 (UTC) | ::::On a frictionless surface, it would ''never'' stop spinning. Once the case starts to spin, there's nothing to slow it down. --[[Special:Contributions/172.69.63.183|172.69.63.183]] 17:45, 19 January 2021 (UTC) | ||
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::: It seems to me like the reason the full tape measure spins is somewhat similar to an Impact Driver. Shooting slow motion videos of retracting my tape measure I see a small rotation in the opposite direction of the rotation in the end (likely due to the device maintaining angular momentum as the spring inside spins up) and then a quick snap when the tape is fully retracted, followed by the tape spinning very quickly in the opposite direction. As for my comparison to an impact, this reminds me a lot of how those work, with some inner barrel spinning at a very high speed, and then mechanically imparting that energy onto the body of the driving head, causing it to turn with a high torque. Typically when you start an impact spinning you can feel a small torque opposite to how the driver end spins because of the inner barrel spinning up. In the tape measure the inner spinning barrel is the tape itself and the spring to retract it, the driver head is the outer shell of the tape measure. [[User:dlvozza|dlvozza]] ([[User talk:dlvozza|talk]]) 19:48, 19 January 2021 (UTC) | ::: It seems to me like the reason the full tape measure spins is somewhat similar to an Impact Driver. Shooting slow motion videos of retracting my tape measure I see a small rotation in the opposite direction of the rotation in the end (likely due to the device maintaining angular momentum as the spring inside spins up) and then a quick snap when the tape is fully retracted, followed by the tape spinning very quickly in the opposite direction. As for my comparison to an impact, this reminds me a lot of how those work, with some inner barrel spinning at a very high speed, and then mechanically imparting that energy onto the body of the driving head, causing it to turn with a high torque. Typically when you start an impact spinning you can feel a small torque opposite to how the driver end spins because of the inner barrel spinning up. In the tape measure the inner spinning barrel is the tape itself and the spring to retract it, the driver head is the outer shell of the tape measure. [[User:dlvozza|dlvozza]] ([[User talk:dlvozza|talk]]) 19:48, 19 January 2021 (UTC) | ||