Graphics Reference
In-Depth Information
Phase Two: Execution Phase
Taking the weight of a light object may require no adjustment of the position
of the figure or result in such a minor movement that any adjustment of the
figure is barely perceptible. Picking up a large, light object that entails more
movement of the arms may need less adjustment to the balance of the entire
figure, since any slight shift of the center of gravity will probably remain within
the figure itself. The act of lifting a light object is more likely to be executed
with the use of the arms alone, which results in a bend at the elbow and wrist.
Phase Three: Resulting Phase
The attainment and maintenance of stability in a moving figure are common
to all actions, though any movement required in achieving stability and
maintaining balance when lifting a light object will require a less extreme
adjustment of the posture. Any additional weight to be offset by such
adjustment around the center of gravity will be less, and therefore the
adjustment will be less. The resulting stage, so obvious in lifting a heavy
object from the ground, which entails a separate and distinct action, may only
be extended to a part of the figure such as the position of the arms and hands.
Lifting a Light Weight with One Hand
Lifting objects simply with the use of the hand, such as the action of lifting a
cup, is naturally a far less dynamic action than one involving the use of the entire
body. The separate phases of the action may not appear as distinct movements.
Phase One: Preparatory Phase
The preparation required for a less extreme lifting action does not usually entail
the shifting of the figure or the alignment of the body to the object in preparation
for the change in combined weight or changes to the center of gravity.
Using the hand alone to lift an object may simply require the alignment of
the hand to the object and the opening of the hand to expose the palm and
extend the fingers.
Phase Two: Execution Phase
The transition into the execution phase, gripping and holding the object and
executing the lift, will often follow faster because less time will be needed
to prepare for the action. The action of the lift may commence at a slower
rate not due to the weight of the object but perhaps as a result of the need
to maintain a balance of the object—in the case of lifting a cup of coffee, to
avoid spilling a hot liquid. Adjusting the balance of the object throughout
the lift may require a fine adjustment of the angle of the hand at the wrist to
maintain stability and orientation of the object.
Phase Three: Resulting Phase
On completion of the action, there will be the same requirement to achieve
stability, though it may not require a separate and distinct movement to
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