Graphics Reference
In-Depth Information
has contact. The more resistance there is at this point, the greater the force
required to move the object. There will be a greater level of potential friction
between an object sitting on a heavily textured or soft surface than one
sitting on a hard, flat, and slippery surface such as ice. Attempting to push
an object with a flat bottom may require more effort than pushing a heavier
object that either has less friction or is designed to aid smoother movement,
such as objects that possess runners, blades, or wheels.
FIG 5.71
a: Man pushing a load on
a hand trolley. b: Woman pushing
wheelchair on flat even ground.
c: Man walking backwards while
steadying a wheelchair as it moves
down a slope.
Pushing a wheeled object such as a wheelbarrow requires far less force to
overcome inertia and enables far greater loads to be shifted for the same
degree of force. The wheel provides a lower level of friction between the
(a)
(b)
(c)
