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  2. Pendulum (mechanics) - Wikipedia

    en.wikipedia.org/wiki/Pendulum_(mechanics)

    The differential equation which governs the motion of a simple pendulum is ... Coordinates of a simple gravity pendulum. Equation 1 can additionally be obtained ...

  3. Harmonic oscillator - Wikipedia

    en.wikipedia.org/wiki/Harmonic_oscillator

    A simple pendulum exhibits approximately simple harmonic motion under the conditions of no damping and small amplitude. Assuming no damping, the differential equation governing a simple pendulum of length l {\displaystyle l} , where g {\displaystyle g} is the local acceleration of gravity , is d 2 θ d t 2 + g l sin ⁡ θ = 0. {\displaystyle ...

  4. Separatrix (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Separatrix_(mathematics)

    Consider the differential equation describing the motion of a simple pendulum: d 2 θ d t 2 + g ℓ sin ⁡ θ = 0. {\displaystyle {d^{2}\theta \over dt^{2}}+{g \over \ell }\sin \theta =0.} where ℓ {\displaystyle \ell } denotes the length of the pendulum, g {\displaystyle g} the gravitational acceleration and θ {\displaystyle \theta } the ...

  5. Phase portrait - Wikipedia

    en.wikipedia.org/wiki/Phase_portrait

    Phase portrait of van der Pol's equation, + + =. Simple pendulum, see picture (right). Simple harmonic oscillator where the phase portrait is made up of ellipses centred at the origin, which is a fixed point. Damped harmonic motion, see animation (right).

  6. Phase space - Wikipedia

    en.wikipedia.org/wiki/Phase_space

    Illustration of how a phase portrait would be constructed for the motion of a simple pendulum Time-series flow in phase space specified by the differential equation of a pendulum. The X axis corresponds to the pendulum's position, and the Y axis its speed.

  7. Generalized coordinates - Wikipedia

    en.wikipedia.org/wiki/Generalized_coordinates

    Simple pendulum. Since the rod is rigid, the position of the bob is constrained according to the equation f (x, y) = 0, the constraint force C is the tension in the rod. Again the non-constraint force N in this case is gravity. Dynamic model of a simple pendulum.

  8. Small-angle approximation - Wikipedia

    en.wikipedia.org/wiki/Small-angle_approximation

    When calculating the period of a simple pendulum, the small-angle approximation for sine is used to allow the resulting differential equation to be solved easily by comparison with the differential equation describing simple harmonic motion.

  9. Holonomic constraints - Wikipedia

    en.wikipedia.org/wiki/Holonomic_constraints

    A simple pendulum. As shown on the right, a simple pendulum is a system composed of a weight and a string. The string is attached at the top end to a pivot and at the bottom end to a weight. Being inextensible, the string’s length is a constant.

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