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Q7.28 A disc rotating about its axis with angular speed is placed lightly (without any translational push) on a perfectly frictionless table. The radius of the disc is
. What are the linear velocities of the points
,
and
on the disc shown in Fig. 7.41? Will the disc roll in the direction indicated ?
Answers (1)
Let the angular speed of the disc is .
So the linear velocity can be written as
(a) Point A:-
The magnitude of linear velocity is and it is tangentially rightward.
(b) Point B:-
The magnitude linear velocity is and its direction is tangentially leftward.
(c) Point C:-
The magnitude linear velocity is and its direction is rightward.
The disc cannot roll as the table is frictionless.
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