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In order to solve mechanics problems,force finding on the objects of the problem is an indispensable step.Also,this step is often difficult for beginners.Therefore,there are several researches proposed supporting method for learners in this step.Error-Based Simulation(EBS)is one of the support methods.In this research,we have experimentally evaluated EBS for a dynamics problems which an object has a velocity at a junior high school.As a result,we have confirmed that EBS is promising method to support force finding correctly.