Controlling the Bounce of a Bottle
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• Physics 16, 102
Dropping a rotating plastic bottle containing water ends in a bounce whose top depends upon the rotation price.
With experiments that call to mind a social media problem, researchers demonstrated management over the bounce top of a dropped plastic bottle partially full of water [1]. The crew, led by Pablo Gutiérrez of O’Higgins College and Leonardo Gordillo of the College of Santiago, each in Chile, confirmed that originally spinning the bottle round a vertical axis strongly reduces the bounce top. The rotation forces water up alongside the partitions, which, upon impression, generates a vertical jet within the heart that may take in a lot of the kinetic power. Like a diver pushing downward on a diving board to achieve top, the liquid within the jet pushes in opposition to the bottle because it strikes upward, stopping the bottle from bouncing as excessive as it could if the water have been quiescent.
Whereas others have noticed that fluid in a dropped container can have an effect on its bounce [2], the brand new experiments are the primary to make use of fluid rotation and the quantity of water to systematically management the bounce top. The researchers developed a easy concept that agrees with the info and predicts that the best suppression of bouncing happens with the best rotation charges (they went as much as 12.7 revolutions per second) and with the bottle about 40% full. They are saying that the mechanism they studied might apply to fluid transport in tank vans or exterior gas tanks of spacecraft, the place planners might probably scale back the results of impacts by permitting additional quantity within the container for fluid movement. The crew encourages readers to strive the experiments at house by swirling and dropping partially stuffed plastic bottles.
–David Ehrenstein
David Ehrenstein is a Senior Editor for Physics Journal.
References
- Okay. Andrade et al., “Swirling fluid reduces the bounce of partially stuffed containers,” Phys. Rev. Lett. 130, 244001 (2023).
- T. W. Killian et al., “Rebound and jet formation of a fluid-filled sphere,” Phys. Fluids 24, 122106 (2012).
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