Graphics Reference
In-Depth Information
FIG 5.72
Sequence of a man pushing
a wheelbarrow with heavy load.
object and the surface through the rolling action as opposed to a sliding
action of two flat surfaces. Once inertia has been overcome, forward
movement may be maintained by the steady application of force, created as
continuous pressure is applied—in this instance, as the figure walks forward. If
the weight is very heavy, the pushing figure will tilt forward from the upright
position to gain greater purchase with the feet on the ground and the body
weight being used to add additional force.
Pulling
Many of the same issues that are evident in a pushing action may also be
seen in a pulling action: the need to overcome the inertia of an object and
the amount of friction between the object and surfaces and the use of body
weight to increase force. Pulling may be undertaken simply by the movement
of the fingers. Greater forces may be exerted simply using the hand with a
movement at the wrist. Pulling an object by the use of rope, if not too heavy,
FIG 5.73
Pulling on a rope hand
over hand.
