A mechanism that is incapable of motion has zero degrees of freedom. In some circumstances, Grubler's formula indicates that the number of degrees of freedom of a mechanism is negative. How should that result be interpreted The constraints implied by the joints must not be independent. The number of joints, the degrees of freedom of those joints, or the number of rigid bodies must have been counted

A mechanism that is incapable of motion has zero degrees of freedom. In some circumstances, Grubler's formula indicates that the number of degrees of freedom of a mechanism is negative. How should that result be interpreted The constraints implied by the joints must not be independent. The number of joints, the degrees of freedom of those joints, or the number of rigid bodies must have been counted

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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What are free-body diagrams of a mechanism? HOw are they helpful in finding the various forces acting on the varioUS members of the mechanism?
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The figure shows a person wearing weight boots and doing lower leg flexion/extension exercise in a sitting position to strengthen the quadriceps muscles and a simple mechanical model of his leg. W1 is the weight of the lower leg, W0 is the weight of the boot, the magnitude of the pulling force applied to the tibia by the quadriceps muscles through the FM patellar tendon, the magnitude of the reaction force acting on the FJ tibiofemoral joint. Point O is the center of the tibiofemoral joint, point A is the point where the patellar tendon attaches to the tibia, point B is the center of gravity of the lower leg, point C is the center of gravity of the weight boot. The distances between point O and points A, B and C were measured as a=12 cm, b=24 cm and c=36 cm, respectively. The angle that the long axis of the tibia makes with the horizontal is β=39°, the angle between the line of action of the quadriceps muscle strength and the long axis of the tibia is α=16°. Points O, A, B and C lie…
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