Most of the motion generated by joints in the human body are examples of levers.

Question

Most of the motion generated by joints in the human body are examples of levers. An class lever is the forearm; the force which generates the motion is located in between the pivot point and the resistance force. The elbow acts as the pivot point, the biceps muscle pulls up on the the mass which is held in the hand. Imagine you are holding an object in your hand with your forearm horizontal and forearm 0.0425 m from the elbow and make an angle of 26.0 with the e of a third to move your upper arm vertical so your elbow creates a 90 angle. If your biceps attach to your I while a 3.14 kg mass is held forearm. Number

Explanation / Answer

Torque due to 3.14 kg is T = F*r*sin(90) = 3.14*9.81*0.3075*sin(90) = 9.47 N-m

but torque due to biceps muscel is T = F*s*cos(theta)

9.47 = F*0.0425*cos(26)

F = 9.47/(0.0425*cos(26)) = 248 N

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