Abstract

In the text “The Cause of Motion”, I argued that force is the cause of motion and that inertial motion is actually a forced motion driven by electromagnetic attraction and repulsion among atoms inside matter. Direct verification of this mechanism would require observing the motion of individual atoms and electrons, which is currently impossible. This paper proposes a macroscopic experiment that can indirectly test the hypothesis. The experiment uses two identical, completely closed, initially stationary vacuum chambers. In one chamber, a single solid elastic ball is ejected along the axis; in the other, an equal mass of ideal gas molecules is ejected along the same axis with the same initial velocity. According to the proposed mechanism, the solid ball can maintain its direction strictly along the axis, so the closed system should show no net displacement. In contrast, gas molecules are multi-atom systems and cannot lock the direction of the internal electromagnetic push-pull to the initial external force direction; their directions become randomized, so the forward momentum is reduced while the backward recoil is not fully cancelled. As a result, the whole closed system may exhibit a net displacement. If Experiment A shows no net displacement and Experiment B shows a net displacement, this would provide indirect but strong evidence for the mechanism proposed in “The Cause of Motion”. The experiment is simple, macroscopic, and requires no microscopic observation or data analysis. If confirmed, it could also lead to the design of a closed-space propulsion device that recycles gas internally and obtains continuous net thrust without expelling propellant.

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