B Calculating Leverage & Force in Lower Leg Squat

  • B
  • Thread starter Thread starter tomlib
  • Start date Start date
AI Thread Summary
To calculate leverage on the lower leg during a squat, one must consider the effective lever arm of the quadriceps, which varies with knee flexion angles and is approximately 5 cm. The external torque can be determined using ground reaction forces or knee position, although some prefer to focus on force distribution through trigonometry. There are concerns about the realism of the movement model being applied, as it may not accurately reflect practical scenarios. The discussion highlights the complexity of biomechanics in squatting and the challenges in understanding the forces involved. Overall, calculating these dynamics requires a careful analysis of various factors influencing the squat.
tomlib
Messages
13
Reaction score
2
How can I calculate the leverage on the lower leg during a squat and the force that the thigh muscle must exert in order for the body to perform the squat. Can you help me?
 
Physics news on Phys.org
tomlib said:
How can I calculate the leverage on the lower leg during a squat and the force that the thigh muscle must exert in order for the body to perform the squat. Can you help me?
You have to look up the effective lever arm of the quadriceps at different knee flexion angles. It varies based on patella anatomy, but is roughly around 5 cm. The external torque can be computed from the ground reaction force, by inverse dynamics (if you care about the shank and foot mass), or just from the knee position.
 
I would not count the torque, I would like to stick to the classic distribution of forces by vectors using trigonometry and crank calculation. Unfortunately, I don't have such an opportunity to understand everything. This movement seems unrealistic to me.

I saw how much work it can be to raise a sail for windsurfing.
When applying this model, the rope is actually in line with the boom, such a force is impossible.
 
tomlib said:
This movement seems unrealistic to me.
A simple squat?
 
Thread 'Is 'Velocity of Transport' a Recognized Term in English Mechanics Literature?'
Here are two fragments from Banach's monograph in Mechanics I have never seen the term <<velocity of transport>> in English texts. Actually I have never seen this term being named somehow in English. This term has a name in Russian books. I looked through the original Banach's text in Polish and there is a Polish name for this term. It is a little bit surprising that the Polish name differs from the Russian one and also differs from this English translation. My question is: Is there...
Hi there, im studying nanoscience at the university in Basel. Today I looked at the topic of intertial and non-inertial reference frames and the existence of fictitious forces. I understand that you call forces real in physics if they appear in interplay. Meaning that a force is real when there is the "actio" partner to the "reactio" partner. If this condition is not satisfied the force is not real. I also understand that if you specifically look at non-inertial reference frames you can...
Back
Top