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椎体上滚 (2).png


锥体上滚    

        将双锥体置于轨道低的一端,松手后,它似乎摆脱了地球重力场的引力反而向轨道高端滚去。此展品中两根轨道组成的平面与水平桌面形成的坡度角(α)、双锥体的锥顶角(β)和双轨之间的夹角(γ)是经过精心设计的:只有当三个角度符合:tgβ/2·tgγ/2 > tgα 时,双锥体才从双轨低端向高端滚动;滚动时,双轨对双锥体的支承点不断向双锥体顶尖处外移,结果双锥体在向轨道高端滚动时,重心仍然是下降的。


Cone rolling upwards    

        Put a biconic body on the lower ends of two rails, on loosening your grip, it seems as if it frees itself from the gravitation in the earth gravitational field to roll towards the higher ends of the two rails.     The slope angle (α) included between the plane which contains the two rails and the horizontal table plane, the biconic body’s cone apex angle (β) and the angle (γ) included between the two rails of this exhibit are well-designed.Only when the three angles are in conformity with a correlation of tgβ/2·tgγ/2>tgα,the biconic body rolls along the two rails from their lower ends to their higher ends; during the rolling period, the rails’ support points to the biconic body increasingly move outside the apex points of the biconic body respectively and the center of gravity of the biconic body is getting down.    

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