
Charnwood Dynamics Ltd. Coda cx1 User Guide – Advanced Topics III - 4
CX1 USER GUIDE - COMPLETE.doc 26/04/04
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Scalar quantities are in normal type, e.g. µ
We shall require the use of both scalar and vector products of two vectors, shown
respectively as v
1
.v
2
and v
1 ^
v
2
.
Subscripts are used for a variety of purposes: to specify a component of a vector (e.g. R
x
is the ‘x’ component of reaction vector R ), or else to attach a segment label (e.g. Q
f
is
torque applied to the foot).
We can now proceed with the analysis, beginning with the foot which, treated as a free
body, is subject to a number of linear forces such as weight due to gravity acting at the
segmental mass centre, the resultant of accumulated ground reaction acting at the
allocated centre of pressure, and the ankle-joint reaction which, taken in conjunction
with the athropometric data, enable us with the method of inverse dynamics to determine:
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