The biceps brachii is puling on the forearm with a force of 1000N at an angle of
ID: 92884 • Letter: T
Question
The biceps brachii is puling on the forearm with a force of 1000N at an angle of 25 degrees. The brachialis has a force of 750N and is attached at an angle of 30 degrees. Finally, the brachioradialis is pulling with a force of 900N at an angle of 15 degrees.
What are the rotary & tangential forces of these muscles?
What are the composite forces of these muscles?
What is the maximum amount of resistence that can be used for a sucessful arm flexion if the average arm is 0.73m?
Please help. I do not know the necessary steps to answer the following questions. Please solve with all work shown neatly. Thank you.!
Explanation / Answer
1.Rotary force- forces of muscles perpendicular to the lever arm.So we have to add all the horizontal components of the force.But the brachioradialis acts downward in direction.
rotary force = (100cos 25° + 900cos 15° - 750cos 30°) = 612N
2.Tangential forces _ hear we will add all the tangential components
tangential force = (1000sin25° + 900sin15° +750sin30°) = 1022N
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