Fig. 13.4 shows an oscillating pendulum.


Time taken by the bob to move from A to C is t 1 and from C to O is t 2 . The time period of this simple pendulum is

Time period is time taken by the pendulum to complete one oscillation.

one oscillation =


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time taken from A to O and O to B is the same.


One oscillation = (A to C) + (C to O) + (O to B) + (O to C) + (C to A)


= (t1 + t2) + (t1 + t2) + (t1 + t2)+ (t1 + t2) = 4(t1 + t2)

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