ps3 - Biology 427 Biomechanics For this problem set assume...

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Biology 427 Biomechanics For this problem set assume that all biological materials are Hookean – that is they have a linear stress strain relationship. Data Human mass = 100 kg Hobbit mass = 25 kg Bumblebee mass = 0.005 kg Human Achilles tendon length = 10 cm Human Achilles tendon cross sectional area = 1 cm 2 Earth’s gravitational acceleration = 10 m/s 2 Material Stiffness (GN/m 2 ) Strengty (MPa) Density (kg/m 3 ) Human bone 20.0 110 2000 Human tendon 0.6 82 1000 Human cartilage 0.02 1.4 1000 Clam shell 30 42 2700 Insect cuticle 9.5 95 1200 Crab cuticle 30 100 1900 Spider silk 5 350 1000 heel Toe F tendon = ? F = m g 5 cm 10 cm
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1. During slow walking, or in standing on the toes of one foot, your mass is supported by a small portion of the foot in contact with the ground. We are interested in computing the stress in the tendon of Achilles and the resultant strain. A. Use the diagram, data, and assumptions above to compute the stress in the Achilles tendon. To do so you should assume that the moment (torque)
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ps3 - Biology 427 Biomechanics For this problem set assume...

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