The main bone of the forearm is connected to the arm bone through the elbow joint. Two muscles, the triceps and the biceps, are attached to this bone, on either side of the joint. The diagram below represents feel a pattern of the forearm. The bones and the flesh of the forearms, including the hand, are represented by a rod homogeneous of 1,5 kg having a length of 40,1 cm. The articulation is a pivot attached to the vertical arm bone (considered fixed). As a muscle can only pull, never push, the triceps and biceps are represented by strings: the triceps is fixed at the end left of the forearm, 0,9 cm from the pivot; the bicep is attached to 3,5 cm to the right of the pivot. (a) In this situation, which muscle allows the forearm to remain in balance? What is the modulates the tension in this muscle? (b) We add a block of 3,6 kg on the hand, 35,1 cm from the elbow joint; if the forearm remains horizontal, which becomes the module of the voltage calculated in (a)?
A model of the forearm.
The main bone of the forearm is connected to the arm bone through the elbow joint.
Two muscles, the triceps and the biceps, are attached to this bone, on either side of the joint. The diagram below represents feel a pattern of the forearm. The bones and the flesh of the forearms, including the hand, are represented by a rod homogeneous of 1,5 kg having a length of 40,1 cm. The articulation is a pivot attached to the vertical arm bone (considered fixed). As a muscle can only pull, never push, the triceps and biceps are represented by strings: the triceps is fixed at the end left of the forearm, 0,9 cm from the pivot; the bicep is attached to 3,5 cm to the right of the pivot.
(a) In this situation, which muscle allows the forearm to remain in balance? What is the modulates the tension in this muscle?
(b) We add a block of 3,6 kg on the hand, 35,1 cm from the elbow joint; if the forearm remains horizontal, which becomes the module of the voltage calculated in (a)?
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