Comment on I'm a 6'1" man with size 3 feet which means every they measure my feet at a shoe store, the Brannock device gatekeeps my gender

• NocturnalMorning@lemmy.world ⁨15⁩ ⁨hours⁩ ago

  Uh, no, that’s actually the opposite of how that works. Pressure is force per area, and torque is the cross product of force and length (at right angles). The smaller the area, the higher the pressure. The smaller the foot, in this case, the harder the muscles have to work to create the same torque (or moment). #ThanksForAttendingMyPhysics101TEDTalk

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  • deranger@sh.itjust.works ⁨14⁩ ⁨hours⁩ ago

    The smaller the foot, in this case, the harder the muscles have to work to create the same torque (or moment).

    Isn’t that backwards? A shorter lever requires less force. If you had a 10 foot long foot, you’d have to have insanely strong calf muscles to stand on your tip toes.

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    • NocturnalMorning@lemmy.world ⁨14⁩ ⁨hours⁩ ago

      True, i didn’t consider the point of contact.

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    • LustyArgonianMana@lemmy.world ⁨13⁩ ⁨hours⁩ ago

      This isn’t totally true (about longer limbs=harder to exercise), because it doesnt take into account how myosin works on a longer muscle/surface area, along with how electrical differences between limbs and the torso help with electrical flow due to potential energy.

      Look at a thoroughbred (fastest over medium distance), an Arabian (best for endurance), a quarter horse (fastest in burst over short distance) versus a donkey (stronger pound for pound than a horse but not faster), vs a mule (stronger than horse, faster than donkey). Look at their legs. They are walking on (1) finger, look at where their ankle is. Their feet, like many animals, are angled completely differently than humans. Elephants have a similar foot to humans in that their sole contacts the ground, but obviously their feet don’t extend like ours (and they have bigger muscles). So it is interesting but I think theres more to it

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      • deranger@sh.itjust.works ⁨12⁩ ⁨hours⁩ ago

        It’s totally true from a physics standpoint. A longer lever arm between the load and fulcrum requires more force to move the same weight for a type 1 lever, all else being equal.

        “Harder to exercise” is poorly defined, especially when you go on to discuss endurance, speed, and force, all of which are very different terms.

        I totally get what you’re saying, but I specifically narrowed it down to force for a reason. My shorter friends kick my ass in lifting due to the mechanical advantage their shorter limbs have, but I smoke them in a distance run because my longer limbs allow me to traverse a greater distance in a single step. This is complicated though because larger lungs are a factor here too.

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  • jerkface@lemmy.ca ⁨13⁩ ⁨hours⁩ ago

    The foot bears more than 100% of your weight because it is cantilevered.

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• deranger@sh.itjust.works ⁨15⁩ ⁨hours⁩ ago

  That would be relevant to the calf muscles, but the lower surface area of the feet means higher pressure in terms of psi or pascals.

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  • Leggomylego@lemmings.world ⁨15⁩ ⁨hours⁩ ago

    Yes I can confirm that there’s more pressure on my feet if my wearing out kids shoes every 6 months is anything to go by. They are not designed for a man of my height and weight!

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    • LustyArgonianMana@lemmy.world ⁨13⁩ ⁨hours⁩ ago

      Have you ever had custom shoes made? Or checked what adult little people wear? They may have some suggestions

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