I'm putting together some rough ideas for physical experiment designs and datasets, relating to multiple hypotheses for quantum gravity.
Because I'm working on experiments to test theories of gravity, I need to be able to reliably measure the mass of physical objects, without relying on gravity for the measurement.
(for experimental control)
So, for example, I can't use scales or balances.
My first instinct is to use force or momentum/inertia, and rearrange the equations to solve for mass.
But these would require me to measure either force or momentum, again, without relying on gravity to make the measurement.
Maybe it's staring me right in the face, but I'm drawing a blank.
What are some simple methods of measuring either mass, force, or momentum that don't rely on gravity?