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7.3 Simple Pendulum
A Simple Pendulum performs oscillatory motion. Its bob performs S.H.M. under small oscillation approximation.
On the bob forces acting at any instant are tension
Resolving `mg' as shown, 
[-ve sign takes care of direction of the mg sin q component with reference
to that of displacement]
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7.1 Linear Simple Harmonic Motion Follow @Pinkmonkey_com  |
in the string and
weight `mg'. 