High acceleration movements of a precision stage result in reaction forces that lead to mechanical resonance in the stage,which reduces the tracking accuracy and lengthens the positioning time.

With the advantages of using a ring as the attracting mass when the interaction distance can be shortened down to 2 cm or less and using the mechanical resonance method when the amplitude of the torsion balance can be amplified by Q times, it is expected that the test of the Newtonian inversesquare law of gravity can be carried out at a high accuracy of about 2.