A gramophone record is revolving with an angular velocity ω. A coin is p...
Q. A gramophone record is revolving with an angular
velocity ω. A
coin is placed at a distance r from the centre of the record. The
static coefficient of friction is μ. The coin will revolve with the record if
Description : Although qus is based on very well known concept of
circular motion i.e circular turning on road by Friction only, still inequality
relation and no numerical value in
answer ,can make it little bit difficult for some students. Since Static
Friction is a self adjusting force while it will provide required centripetal
force , it will limit this motion according to its maximum value or limiting
value. From this inequality idea will pop up. But if you are not well aware of
the concept of circular turning on road by friction only then things may not be
easy for you.
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