A torsion pendulum has been used to measure very weak forces that limit the resolution of highly sensitive space accelerometers. A new method is described to measure damping with a feedback loop. The main results are (i) an upper limit to time evolution of contact potential differences inside electrostatic space accelerometers, (ii) the stiffness and damping from a very thin conducting wire, and (iii) an additional damping from unknown source. Consequences for space accelerometers design are derived.

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