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...Pranata ogi danika yuliati lia wartono concept acquisition of rotational dynamics by interactive demonstration and free body diagram journal education learning vol pp universitas negeri malang abstract the concepts force motion are essential material in physics however students experience many difficulties this research was conducted to measure through assisted mixed method chosen use test instruments forms multiple choice with open ended questions subjects were xi ipa senior high school sungai penuh indonesia measured before after intervention be analyzed quantitatively obtained n gain score it showed that there a moderate improvement while effect size value showing strongly affected aquisition data also supported results qualitative analysis answers worksheets given during process keywords postgraduate program department faculty mathematics natural sciences jl semarang no e mail ogidanika gmail com fmipa um ac id received may revised july accepted introduction most important is about...