I have become worldwide famous for my threads.
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Are you aware that rock climbers are able to support themselves using just their fingers?Can you do that ? but every person can stand on toes.
So, as usual, there doesn't seem to be a problem to solve.There is a difference between putting a load on toes tips, putting the load on toes, and and putting it on feet balls . A human can stand on toes tips, toes , or a compilation of toes and feet balls .I can stand on my toes only with ease. But if the person on the link put the loads on toes only " and without wearing shoes " they will break joints.
Ballet dancers stand on the toes, but they have reinforced shoes to support them.Of course they need shoes to stand on toes tips since the force I suggested is small but not zero also giving in consideration the toes tips are sensitive
To humans only but not to other masses, and I referred to humans only because it is a better example " everyone can test it"So why did you state earlier 'It is biological that this phenomenon appears only to humans.'?It looks like he just makes this up as he goes along and forgets what he wrote earlier. This results in him contradicting himself a lot.
There is no mathematics for this exact part.It is biological that this phenomenon appears only to humans.It is like physiologically human body stop working after death .
The phenomenon related only to gravity on a human body that is the toes won't bear for instance "equivalent to human body " 80 kg mass put on it it.That will press the toes extremely hard.
Thanks.It is biological that this phenomenon appears only to humans.And several other bipedal species from Tyrannosaurus to chickens. And all quadruped mammals walk on fewer toes than bipeds.
Bones are stronger than concrete.It is not just about breaking bones or tendons.It is a whole collection of factors. The 80 kg mass will cause huge pain, cutting flesh, breaking joints, and above all pressing the toes extremely hard.
On a weight for weight basis tendons are stronger than steel.
I'm waiting for you to supply the math shows that toes can't bear the weight of the body.There is no mathematics for this exact part.It is biological that this phenomenon appears only to humans.It is like physiologically human body stop working after death .
Come back when you have some math to support your claims.You might be confused by the repeated paragraphs.I edited it.I mentioned that the forces are related to each other mathematically , which implies simple proportionality.
It doesn't need to because getting out of a chair isn't akin to the scenario you calculated.Actually , the example doesn't involve body sitting or standing. Reply #16
If I'm sitting in a chair and trying to get into a standing position, the fulcrum would be at the knee instead. Or at least one of the fulcrums would be. Standing up uses many joints and many points of force application. A calculation assuming a simple lever breaks down because of that. You would need to calculate the forces acting along all of the relevant points of the body.
You stated in your calculation that you put the fulcrum at the feetThe calculation is considering the fulcrum to be at the toes
The muscles in your feet do not lift you own their own. Your leg muscles are involved.Right , the force involves my legs force , but do you think the force of feet and legs pressing equal 588 Newton ? or even close to it? you can just press your feet and find out how weak it is .
Your calculation for that wasn't even sensible. People don't stand up by using their feet like that.I presented specific example , which turned out to be very sensible.
I'm not talking about legs I'm talking about feet which is used to carry up a person as I mentioned , The force which should lift a person by his feet is 588 Newton , do you think the feet will provide such force when presses .?
An average man can leg press more than his own weight. That doesn't even take into consideration the other muscles, like those in your core and back, that help with standing up.
The distribution of mass is different and the muscle groups engaged are also different. Have you heard of the concept of leverage? https://en.wikipedia.org/wiki/Lever#Force_and_levers If you consider your legs to be levers and the load is placed at your feet, then that is the worst possible place to put the weight in terms of lifting difficulty. If you put the load on your knees or thighs, it would be easier to lift despite having exactly the same mass.