Overview
Do i have the correct angle ?
I am currently in the process of determining my Fpx strength. However, I noticed that when I do a calculation of the form 85-90 it gives a result of -5, which affects my overall answer by giving a negative number. I think I didn't correctly determine the angle of my muscle strength. Would it be possible for this angle to be 0°? So, by doing the 85-0 calculation, we would get a positive number. Could someone help me clarify this? This is the only part where I'm stuck. I have attached my DCL. (elbow extension)
Σ𝐹⃗ = 0
X=
Σ𝐹𝑥 = 0
−𝐹𝑃𝑥 + 𝐹𝑀 sin (𝛽 − 90°) + 𝐹𝑒𝑙 sin (180 − 𝛽 − 𝜃) = 0 𝐹𝑃𝑥 =
𝐹𝑀 sin ( 𝛽 − 90°) +𝐹𝑒𝑙 sin(180 − 𝛽 − 𝜃)
𝐹𝑃𝑥 = 93.6650N sin (85 − 90) + 28.11N sin(180 − 85 − 79)
Fpx= -8.16344N +7.74816N
𝐹𝑃𝑥 = -0.4154 N←
FM= muscular force
F𝑃𝑥 and Fpy: force in the joint
Fg forearm and hand: weight of the forearm
𝐹⃗ 𝑒𝑙: force of the elastic band
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