Graphics Reference
In-Depth Information
Pushing
As with many actions, the level of force required to complete an action, such
as moving an object, determines the nature of the action. Generally speaking,
the most efficient method using the minimum of effort applies for all actions.
Pushing a button may require only a very small movement that extends no
further than the fingertip. A stronger push may involve the movement of
the entire arm, incorporating movement at the wrist, elbow, and shoulder.
Pushing an object that offers greater resistance may require the use of the
entire body in a way that employs the weight of the body to apply additional
force beyond that applied by the effort of the muscles. During this type of
push the angle of the body may be positioned not directly above the feet, as
in a normal standing or walking gait, but extended beyond the position of
the feet in the direction of the object. In this fashion the weight of the body is
used to provide the additional force.
Pushing a static object requires a degree of force to overcome the inertia
made up of a combination of the object's mass and any friction between
the object and the points of contact with any surface on which it sits or
FIG 5.70
Various poses of a figure
pushing a static object.
