Question

Physics of the Human Arm If you have ever done bicep curls at the gym and looked at your arm in the mirror while you were doing it, you might have seen something like Figure 1 (plus or minus tanned skin and/or hair! Figure 1: Outside of arm lifting a weight using mostly the contracted bicep muscles We know what's going on under your skin from anatomy. The bicep muscles are attached via tendons to the top of your shoulder bone and a short way along your radius bone. When you do a bicep curl, your triceps muscles on the under-side of your arm relax and your biceps contract to lift the weight. This is shown in Figure 2 Biceps (contracted) don Biceps relaxed) rus Triceps (relaxed) Triceps (contracted) Radius Insertion Figure 2: The anatomy of the arm lifting a weight using the bicep muscles. In this week's experiment, you are going to be using a set of apparatus that is supposed to be a model of the human arm, lifting a weight using the biceps. pulley large mass (M) load (m) base Figure 3: Apparatus used to model the physics of the human arm Complete the following exercises before lab class for extra marks! Write your answers on a loose sheet of paper you can bring into class and stick in your lab book. Exercise 1 Compare the anatomy of the human arm (Figure 2) with the apparatus that will be used to model the human arm (Figure 3) and label which parts of the apparatus are models of these parts of the arm: a) Radius bone. b) Humerus bone. c) Bicep muscles. d) Hand holding weight. e) Elbow. f Point where bicep attached to radius bone.

Answer 1

hond holding waght -→ radius bonu to raduis bone. hume rus bonu large (M mam > b bau tad Largu uright are lifho