Calculate the torque caused by the biceps muscle across the elbow joint for the

Question

Calculate the torque caused by the biceps muscle across the elbow joint for the individual shown in the diagram. The distance from the elbow joint center to the insertion of the biceps tendon is 0.025 m and FBiceps=100N.

Draw a free body diagram for the ulna and all forces acting on it (joint reaction force at elbow, biceps muscle force, weight of forearm).

Formally create a coordinate system. Write out the direction of basis vectors and the location of the origin selected and then draw these on your free body diagram.

Express the force vector of the biceps and the moment arm in that coordinate system.

Use a vector cross product to calculate the torque applied by the biceps muscle.

Explanation / Answer

Given distance from elbow joint center to insertion ofthe biceps tendon is r = 0.025 m

the force FBiceps = 100 N

and the angle theta = 50 degrees

we know that the torque is T = r X F

= rF sin theta

= 0.025*100 sin 50 N.m

= 1.9151111 N.m

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.