4. A person weighing 72 kg and with height of 1.78 m, stands on tip-toes (both feet). The feet are angled at 55 degrees

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4 A Person Weighing 72 Kg And With Height Of 1 78 M Stands On Tip Toes Both Feet The Feet Are Angled At 55 Degrees 1 (59.21 KiB) Viewed 29 times

4. A person weighing 72 kg and with height of 1.78 m, stands on tip-toes (both feet). The feet are angled at 55 degrees to the horizontal. i) draw a free body diagram of one of the feet with all relevant forces depicted. (20%) ii) using the anthropometric data provided in the tables and figure, determine the foot length and mass, and the location of the foot centre of mass, and indicate these on your diagram. (15%) Centre of mass position as % of segment length (from proximal end) SEGMENT % length Head + trunk Upper arm Forearm + hand Forearm Hand Thigh Shank + foot Shank Foot 61.6 46.1 42.0 42.5 43.3 42.7 46.7 40.4 44.3 Segment mass as % of total body mass SEGMENT % MASS 100 Total body Body less all limbs Upper arm Forearm Hand Thigh Shank Foot 58.04 3.57 1.80 0.60 9.46 4.20 1.35 -63 -485 -377 Fod ligh Segment length as % of body height iii) based on your free body diagram, derive formulae to determine the ankle joint reactions forces and moment to maintain a static position (whilst standing on tip-toes). (50%) iv) solve the equations you have derived, to determine the magnitude and direction of the ankle joint reactions forces and moment (10%) v) state which generic muscle group is likely to be active to generate the joint moment you have determined. (5%) -52