Spherical pendulum.

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In a simple pendulum, bob moves on a circle but a pendulum in which bob is constrained to move on a sphere rather than on a circle is called spherical pendulum. The position of the bob is located by spherical co-ordinate θ , φ as shown in figure. The distance r of the bob from the origin will be the radius of the sphere on which the particle(or bob) moves. The force in this case will not be central, but is constant in the vertical direction.

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