Basic Biomechanics
7th Edition
ISBN: 9780073522760
Author: Susan J Hall
Publisher: McGraw-Hill Education
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Question
Chapter 6, Problem 7AP
Summary Introduction
To determine: The minimal cross sectional area of force applied on muscle.
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ney:
Load (L) = 5 kgs
= Effort
E = Fulcrum
Weight of forearm = 1.8 kgs
L = Load
Biceps brachii
muscle
Distance of load from elbow joint = 35 cm
%3D
Effort (E) = contraction
of biceps brachii
Distance of center of mass of forearm from elbow = 17 cm
Distance of tendon from elbow = 4 cm
A) Draw the free-body diagram to represent the forces and moments
Load (L) = weight of
object plus forearm
B) Write the torque equation for static equilibrium
Fulcrum (F) = elbow joint
If a person has a vertical force of 10.25N with a nylon strap of a 2.5cm of width and length of
10cm in the trapezius muscle, how much time does the person need to feel pain in the
muscle? How much time is needed to injure or damage the muscle? Must show every
mathematical process.
Hill's equation gives a relation between muscle contraction rates νν and muscle tension TT
(T+α)(ν+β)=(T0+α)β(T+α)(ν+β)=(T0+α)β
for positive parameters αα and ββ and resting tension T0T0. Rewrite the equation so that the contraction rate is a function of tension.
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