What is the Differential Equation for This Mechanical System?

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The discussion focuses on deriving the differential equation for a mechanical system involving a mass, a spring with spring constant K, and a dashpot with damping constant G. The participants clarify that the dashpot applies a force proportional to the velocity, specifically -G times the velocity. The uncertainty regarding the variable f(t) is addressed, with consensus leaning towards it representing a force rather than a position. The system's dynamics can be analyzed using Newton's laws or Lagrangian mechanics.

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Homework Statement



In this problem I'm asked to give the differential equation of the mechanical system in the following diagram:

http://www.jelp.org/imagenes/mech.jpg

Homework Equations



Once i understand the diagram, i'll get the motion equation by Newton or lagrange. But what is G in the diagram?? I can't ask to the "creator of the draw". Is the black dot fixed? What do you think?? Thanks a lot...
 
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The "squggle" is a spring with spring constant K, the box is a mass. The open box G is a "dash pot" or dampener with dampening constant G (applies a force -G times the velocity) and of course the wall on the right is a wall i.e. fixed point.

I'm not sure about the f(t), whether that is a force or a position x1=f(t). My guess is that it is indeed a force.
 

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