/sci/ - Science & Math » Thread #13488648

244KiB, 1200x900, push-ups.jpg

View Same Google iqdb SauceNAO

get in here engineerfags

Anonymous Sun 08 Aug 09:43:22 2021 No.13488648 View Reply Original Report

Quoted By: >>13488676 >>13488685 >>13488688 >>13488744 >>13488752 >>13488812

What % of your weight exactly are you lifting during pushups? Is it a simple question of trigonometry, or is there a more complicated calculation of weight/forces here?
Also where exactly would your center of mass be?

Anonymous

Anonymous Sun 08 Aug 2021 09:53:14 No.13488676 Report

Quoted By:

>>13488648
im pretty sure it changes depending on the on the angle
>pushing yourself away from a wall is easier, then pushing yourself up from the ground

Anonymous

Anonymous Sun 08 Aug 2021 09:57:17 No.13488685 Report

Quoted By: >>13488688 >>13488698

>>13488648
Integrate the bodyweight over the moment arm to get the force at any given angle. Human bodies are not uniform density along the Z axis.

Anonymous

Anonymous Sun 08 Aug 2021 09:58:26 No.13488688 Report

Quoted By: >>13488698 >>13488722

>>13488685
>>13488648
But for a rough first order approximation, you can just say about half your body weight.

Anonymous

View Same Google iqdb SauceNAO EZY.jpg, 109KiB, 1000x1000

Anonymous Sun 08 Aug 2021 10:01:07 No.13488691 Report

Quoted By: >>13488698

just take your body weight at COM which is at
>The center of mass of the human body depends on the gender and the position of the limbs. In a standing posture, it is typically about 10 cm lower than the navel, near the top of the hip bones.

Anonymous

Anonymous Sun 08 Aug 2021 10:04:40 No.13488698 Report

Quoted By:

>>13488691
To find COM you need to >>13488685 which generally results in >>13488688 as per your quote.

Anonymous

Anonymous Sun 08 Aug 2021 10:17:19 No.13488722 Report

Quoted By: >>13488729

>>13488688

For rough approximation I would say that you calculate moment arm as the distance from your center of gravity (which would be located roughly at the hip/lower abdominal area) to your arms. Idealizing the distance between your center of gravity to your arms as being roughly half that of the distance between your center of gravity to your feet you get that you are lifting roughly 2/3 of you bodyweight during a pushup. I did a quick experiment where I put my arms on a weight while in pushup position and and the experimental value fits the theoretical value to a good degree (ie. 52 kg readout at a body mass of 73 kg which would mean I am lifting 72 % of my bodyweight).

Anonymous

Anonymous Sun 08 Aug 2021 10:19:48 No.13488729 Report

Quoted By: >>13488742

>>13488722
2/3 is approximately half in my book lol

Anonymous

Anonymous Sun 08 Aug 2021 10:23:13 No.13488737 Report

Quoted By: >>13488783

Do a pushup on a scale and there ylu go. It's about 2/3 bodyweight.

Anonymous

Anonymous Sun 08 Aug 2021 10:25:54 No.13488742 Report

Quoted By:

>>13488729
>t. engineer

Anonymous

Anonymous Sun 08 Aug 2021 10:26:37 No.13488744 Report

Quoted By:

>>13488648
Half the cosine to the angle?

Anonymous

Anonymous Sun 08 Aug 2021 10:30:44 No.13488752 Report

Quoted By:

>>13488648
i remember reading somewhere that's its roughly 70-80 percent of bodyweight, if you elevate your feet a bit it get more

Anonymous

Anonymous Sun 08 Aug 2021 10:42:07 No.13488783 Report

Quoted By:

>>13488737
This.

Anonymous

Anonymous Sun 08 Aug 2021 10:55:29 No.13488812 Report

Quoted By:

>>13488648
It's a simple question of assuming the pushup position with your hands resting on a scale and dividing that number by the number you get when standing on that same scale. Converting this ratio to percentage is left as an exercise to the reader.

Capcode	All Only User Posts Only Moderator Posts Only Admin Posts Only Developer Posts
Show Posts	All Only With Images Only Without Images
Deleted Posts	All Only Deleted Posts Only Non-Deleted Posts
Ghost Posts	All Only Ghost Posts Only Non-Ghost Posts
Post Type	All Only Sticky Threads Only Opening Posts Only Reply Posts
Results	All Grouped By Threads
Order	Latest Posts First Oldest Posts First

Your latest searches