On the physical sample of “ discontinuous differential equations ”












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The following source contains several physical examples: https://arxiv.org/pdf/0901.3583.pdf.



How can I get the differential equation in "Example 2: Brick on a frictional ramp"? How can I grasp this as a math student?




$$
dot{v}(t) = g(sin theta) − nu g(cos theta) text{sign}(v(t))
$$




Moreover, do you think there is a physical form of the equation in "Example 3: Non-smooth harmonic oscillator"? (like exp 2.)



Thank you very much in advance for your answers.










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    0












    $begingroup$


    The following source contains several physical examples: https://arxiv.org/pdf/0901.3583.pdf.



    How can I get the differential equation in "Example 2: Brick on a frictional ramp"? How can I grasp this as a math student?




    $$
    dot{v}(t) = g(sin theta) − nu g(cos theta) text{sign}(v(t))
    $$




    Moreover, do you think there is a physical form of the equation in "Example 3: Non-smooth harmonic oscillator"? (like exp 2.)



    Thank you very much in advance for your answers.










    share|cite|improve this question











    $endgroup$















      0












      0








      0





      $begingroup$


      The following source contains several physical examples: https://arxiv.org/pdf/0901.3583.pdf.



      How can I get the differential equation in "Example 2: Brick on a frictional ramp"? How can I grasp this as a math student?




      $$
      dot{v}(t) = g(sin theta) − nu g(cos theta) text{sign}(v(t))
      $$




      Moreover, do you think there is a physical form of the equation in "Example 3: Non-smooth harmonic oscillator"? (like exp 2.)



      Thank you very much in advance for your answers.










      share|cite|improve this question











      $endgroup$




      The following source contains several physical examples: https://arxiv.org/pdf/0901.3583.pdf.



      How can I get the differential equation in "Example 2: Brick on a frictional ramp"? How can I grasp this as a math student?




      $$
      dot{v}(t) = g(sin theta) − nu g(cos theta) text{sign}(v(t))
      $$




      Moreover, do you think there is a physical form of the equation in "Example 3: Non-smooth harmonic oscillator"? (like exp 2.)



      Thank you very much in advance for your answers.







      real-analysis ordinary-differential-equations dynamical-systems stability-in-odes discontinuous-functions






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      share|cite|improve this question













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      edited Jan 11 at 13:54









      Namaste

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      1










      asked Jan 11 at 13:23









      ODumanODuman

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