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The purpose of this paper is to investigate a double torsion pendulum with planar frictional contact. The single torsion pendulum with one-degree-of-freedom is an angular equivalent of the linear harmonic oscillator. The second degree of freedom has been obtained by adding a free body to the inverted single torsion pendulum. The free body's angular displacement is caused by frictional forces appearing in the interface (contact zone) between the free body and the pendulum column's headdoi:10.1515/ama-2015-0033 fatcat:li75n3hxkvhtpfqhhv6mcpufzq