Chapter 10
Rotation of a Rigid Object
about a Fixed Axis

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Rigid Object
z
A rigid object is one that is
nondeformable
z
The relative locations of all particles making up
the object remain constant
z
All real objects are deformable to some extent,
but the rigid object model is very useful in many
situations where the deformation is negligible
z
This simplification allows analysis of the
motion of an extended object

Angular Position
z
Axis of rotation is
the center of the
disc
z
Choose a fixed
reference line
z
Point P is at a
fixed distance r
from the origin
z
A small element
of the disc can be
modeled as a
particle at P

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