BASIC BIOMECHANICS
8th Edition
ISBN: 9781259913877
Author: Hall
Publisher: RENT MCG
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Chapter 3, Problem 10AP
Two muscles develop tension simultaneously on opposite sides of a joint. Muscle A, attaching 3 cm from the axis of rotation at the joint, exerts 250 N of force. Muscle B, attaching 2.5 cm from the joint axis, exerts 260 N of force. How much torque is created at the joint by each muscle? What is the net torque created at the joint? In which direction will motion at the joint occur? (Answer: A, 7.5 N-m; B, 6.5 N-m; net torque equals 1 N-m in the direction of A)
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Students have asked these similar questions
How much force must be produced by the biceps brachii, attaching at 90? to the radius
at 3 cm from the center of rotation at the elbow joint, to support a weight of 200 N held
in the hand at a distance of 30 cm from the elbow joint? (Neglect the weight of the
forearm and hand, and neglect any action of other muscles)
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
Two lifter's knees are of interest at a specific moment in their lifts. In both lifts,
the knee extensor torque is 100 Nm, requiring quadriceps tendon/patella
ligament forces of 1000 N (about 220 Ibs). Despite equivalent knee torques and
quadriceps forces, patellofemoral joint forces are higher on the knees of lifter A.
Briefly explain why.
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Chapter 3 Solutions
BASIC BIOMECHANICS
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