BASIC BIOMECHANICS
BASIC BIOMECHANICS
8th Edition
ISBN: 9781259913877
Author: Hall
Publisher: RENT MCG
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Chapter 13, Problem 5AP

A patient rehabilitating a knee injury performs knee extension exercises wearing a 15-N weight boot. Calculate the amount  of torque generated at the knee by the weight boot for the four positions shown, given a distance of 0.4 m between the  weight boot’s CG and the joint center at the knee. (Answers: a. 0; b. 3 N-m; c. 5.2 N-m; d. 6 N-m)

Chapter 13, Problem 5AP, A patient rehabilitating a knee injury performs knee extension exercises wearing a 15-N weight boot.

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< The three main forces that act on the patella are shown on the diagram of the knee joint below. These forces are the quadriceps muscle force (FQ), the patella ligament force (FPL), and the patellofemoral joint reaction force (FPF). The angles a and ẞ are with respect to a line that is perpendicular to FPF. Assuming a = 15°, ẞ = 20°, and FQ = 3725 N, use equations for static equilibrium to calculate (a) FPL, and (b) FPF. (Hint: To solve this problem consider using a coordinate system that is aligned with the principal axes of the patella instead of the usual vertical and horizontal axes). (c) Many people assume FQ and FPL are always equal in magnitude but this is only true under certain circumstances. Under what conditions are FQ and FPL equal in magnitude? Fo FPF FP B GriffithUNIVERSITY Queensland Australia
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Discuss the biomechanical factors that influence the ability of the thigh, leg, and foot to rotate about the hip joint during a sprinting stride. (Please answer give quickly)
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