# Simple-pendulum meaning

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The small oscillations of a simple pendulum in a vertical plane also come under equation (5).

This coincides with the equation of motion of a simple pendulum [E 13 (15)] of length 1, provided 1= hf/h.

If we produce OG to P, making OP =1, the point P is called the centre of oscillation; the bob of a simple pendulum of length OP suspended from 0 will keep step with the motion of P, if properly started.

If it could be arranged that the period of a small oscillation should be exactly the same about either edge, the two knifeedges would in general occupy the positions of conjugate centres of suspension and oscillation; and the distances between them would be the length 1 of the equivalent simple pendulum.