In physics, a "'spherical pendulum "'is a higher dimensional analogue of the pendulum.
2.
Consider the spherical pendulum, a mass ( known as a " pendulum bob " ) attached to a rigid rod of length of negligible mass, subject to a local gravitational field.
3.
For a 3d example, a spherical pendulum with constant length " l " free to swing in any angular direction subject to gravity, the constraint on the pendulum bob can be stated in the form
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