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How does the viscosity of a fluid in a circular can affect the way the can rolls? For example, 2 cans of similar size, volume, and mass are rolled down a ramp with the same slope. The can with a viscous liquid will take more force to begin rolling than a can with a less viscous liquid, but once it gets moving the thicker liquid will roll a longer distance. As a result, on a shallow ramp, the more viscous can will hardly begin to roll and will go a lot shorter than the other one, but on a high sloped ramp, the more viscous can will begin to roll very fast and go a lot further than the less viscous one. I have tried looking up viscosity but couldn't really find much related.

What are some theories or concepts that can help explain why this occurs?

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High viscosity fluid can flow less than a fluid of low viscosity. High viscosity indicates high internal resistive instinct of the fluid to flow. So when the can of fluid having high viscosity starts to roll, the internal layers of fluid experiences greater fluid friction among its layers and provide greater resistivity against rolling. So this can needs more force to roll than the other can. And for an analogy of it think of inertial mass of matter. The more mass it has, the more force it needs to accelerate. High viscosity fluids are thicker than the low viscosity fluids. May be this thickness(or, density) has something to do with its motion. Another interesting thing hot water runs faster than cold water due to the difference of viscosity.

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