This paper proposes "Interactive passive walker" for reducing moving away from the sciences. This contents is composed of dynamics simulation engine, ODE, and a physical interface, "Wii board". They are interactive contents which can perform the simulation of a passive walk and can investigate the angle of a hill on real time. The usefulness of these contents is explained and an improving point is shown. Furthermore, the Web contents which assist an understanding of a study process with this paper are also proposed. The power of transposing a difficult problem to an easy example and guessing an action from equation is given. We want to give children the interest to science and to reduce moving away from the sciences by these contents.