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Two rulers are tightly held against each other. A round projectile (e.g. a plastic bottle cap or a ball) is inserted between them close to one of their ends. When extra force is exerted on the surface of the rulers, the projectile is ejected at a high speed. Investigate this effect and the parameters that affect ejection speed.
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Characterization of friction force dynamics
This article presents a model building, which, starting from the generic mechanisms behind friction, leads to the construction of a model that explains observed macroscopic friction behavior. Two friction regimes, the presliding regime and the gross sliding regime, are revealed.