Biomechanics - 9 - Application of Statics

• anatomical axes of rotation are known 

• only 1 muscle group is controlling the movement 

• muscle attachment locations are known 

• line of action of muscle tension is known 

• segmental weights and COMs are known 

• friction is negligible, dynamics are ignored, only 2D problems, deformation is ignored 

what are the basic assumptions and limitations of statics when being applied to biomechanics:

tension

______ force tends to elongate or stretch

compression

______ force tends to shrink

coplanar

______ forces act on a 2D surface

collinear

_______ forces have a common line of action

concurrent 

_______ forces have a common point of intersection 

parallel

_______ forces have lines of action that are parallel

• tensile

• coplanar

• concurrent

based on this image, what are the 3 types of forces present:

• tension (a)

• compression (b)

• collinear

based on this image, what are the 3 types of forces present?

collinear

based on this image, what type of force is being presented?

parallel

based on this image, what type of force is being presented?

go look at the examples in the slides! (cuff weight, pulley, NK table)

go look at the examples in the slides!