How do you determine the net effect of two muscle pulls applied to the same spot? What is this process called?

Question

Quizplus · Accepted Answer

The Answer is You find the resultant pull of the two forces by drawing the two forces,creating a parallelogram by adding sides parallel to each of the forces,and drawing a diagonal within the parallelogram.The resultant is the diagonal with its point of application at the original source and whose arrow head (limit of magnitude)is at the opposite corner of the parallelogram.This is called composition of forces.

How Do You Determine the Net Effect of Two Muscle