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Equilibrium of a spring and speed.

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  1. Aug 27, 2015 #1
    Let's say I have a mass attached to an oscillating spring on a friction less horizontal surface. Why is it that the speed of the mass is greatest at equilibrium? I would have thought it would be greatest just before reaching the amplitudes due to maximum kinetic energy?
     
  2. jcsd
  3. Aug 27, 2015 #2
    Because the restoring force accelerates the mass till it reaches the equilibrium position .

    On the contrary , the speed decreases and becomes zero when the mass reaches the extreme point.
     
  4. Aug 27, 2015 #3
    I see so as it passes the equilibrium, does the net force begin acting opposite to the motion decreasing velocity?
     
  5. Aug 27, 2015 #4
    Right .
     
  6. Aug 27, 2015 #5
    Thank you
     
  7. Aug 28, 2015 #6

    Doc Al

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    Staff: Mentor

    The restoring force always acts toward the equilibrium point. So, when the mass moves toward the equilibrium point, the force speeds it up; when it moves away, the force slows it down.
     
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