Tricker & Tricker, The
Science of Movement. 215
The red dots in the figure
are placed on the joints in which the legs and arms rotate about.
The black lines
connect the
labeled joints and are referred to as links.
The blue curved
arrows show
the direction of the rotating links.
E.g. Link CD is
rotating
counterclockwise around C, link BC is rotating counterclockwise around
B, link
AB is rotating clockwise around A, link FG is rotating counterclockwise
around
F, and link EF is rotating counterclockwise around E.
There are
several different
motions going on including the rotating links, the rectilinear motion
of the
runner’s body as a whole, and the curvilinear motion of some of the
links.
The runner’s
legs and arms
work together to propel the body forward across the ground in a
translational
motion which could be straight or curvilinear depending upon the course
in which
he is running on.
The motion of
links FG, CD,
and BC are all rotating about a joint but they are also links that are
at the
end of other rotating links and so they have a curvilinear motion as
well.
Tricker & Tricker, The Science of Movement. 215
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