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Body

Content type
User Generated
Subject
Physics
School
University of Pittsburgh
Type
Homework
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On average, a torso is 50.8% of someone’s body weight, the head 7.3%, and a thigh 9.88% as taken
from (Tözeren, 2000). For an adult of 170cm and 70kg, that would mean:



 



 





 
 

   



 

  
(when taking the length of the thigh as 43cm and B as the half of that.
2.  


The force on the quadriceps is too high, therefore one cannot rise from the chair while maintaining
upwards position. A small tilt of the torso is necessary. What this does is to move the centre of gravity
closer to the knee joint, therefore reducing the moment on the knee joint, to make the force on the
quadriceps bearable, as it can be seen in the images.

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On average, a torso is 50.8% of someone’s body weight, the head 7.3%, and a thigh 9.88% as taken from (Tözeren, 2000). For an adult of 170cm and 70kg, that would mean: 𝑚𝑡𝑜𝑟𝑠𝑜 = 50.8 × 70 = 35.56𝑘𝑔 100 𝑚ℎ𝑒𝑎𝑑 = 7.3 × 70 = 5.11𝑘𝑔 100 𝑚ℎ𝑒𝑎𝑑+𝑡𝑜𝑟𝑠𝑜 = 40.67𝑘𝑔 𝑚𝑡ℎ𝑖𝑔ℎ = 9.88 × 70 = 6.916𝑘𝑔 100 𝑀 = 𝐵 ∙ 𝐺𝑡ℎ𝑖𝑔ℎ + 2𝐵 ∙ 𝐺𝑡𝑜𝑟𝑠𝑜 = 𝐵𝑔(𝑚𝑡ℎ𝑖𝑔ℎ + 2𝑚𝑡𝑜𝑟𝑠𝑜 ) = 167.76𝑁 ∙ 𝑚 (when taking the length of the thigh as ...
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