Navigation Links
Jump rope aerodynamics
Date:11/21/2010

WASHINGTON, D.C., November 21, 2010 -- Jump ropes are used by kids for fun and by athletes for training. But what about the underlying physics? How do jump ropes work? Can important engineering principles be studied?

Jeff Aristoff and Howard Stone of Princeton University have built themselves a robotic jump rope device that controls all the rope parameters -- rope rotation rate, rope density, diameter, length, and the distance between "hands." They capture the motion of the ropes by high-speed cameras, one to the side and one at the end. Then they compare the observed behavior with predictions made by their equations -- work they are presenting today at the American Physical Society Division of Fluid Dynamics (DFD) meeting in Long Beach, CA.

"Our main discovery is how the air-induced drag affects the shape of the rope and the work necessary to rotate it," says Princeton researcher Jeff Aristoff. "Aerodynamic forces cause the rope to bend in such a way that the total drag is reduced." (Leaves do this too when they bend out of the wind.) This deflection or twisting is most important in the middle of the rope and the least at the ends. If the rope is too light it might not clear the body of the jumper.

"Implications for successful skipping will be discussed, and a demonstration is possible," said Aristoff about his presentation at the meeting. "Fluid dynamic effects on long flexible filaments occur in both engineered structures and many natural systems, so insights from the jump rope will hopefully inform other common situations," he added.


'/>"/>

Contact: Jason Socrates Bardi
jbardi@aip.org
301-209-3091
American Institute of Physics
Source:Eurekalert

Page: 1

Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/7/2017)... 7, 2017 Brandwatch , the leading social intelligence ... Prince,s Trust to uncover insights to support its reporting, help ... The UK,s leading youth charity will be using Brandwatch Analytics ... get a better understanding of the topics and issues that are ... ...
(Date:3/2/2017)... LONDON , March 2, 2017 Summary ... require to better understand Merck KGaA and its partnering ... report: https://www.reportbuyer.com/product/3605601/ Description The Partnering Deals ... into the partnering activity of one of the world,s ... reports are prepared upon purchase to ensure inclusion of ...
(Date:2/28/2017)... 28, 2017   Acuant , a leading provider ... significant enhancements to new and core technologies building upon ... include mobile and desktop Acuant FRM TM facial ... a real time manual review of identity documents by ... the fastest and most accurate capture software to streamline ...
Breaking Biology News(10 mins):
(Date:3/29/2017)... ... March 29, 2017 , ... On the heels of the ... Colpitts Clinical Trial Travel has announced that it will manage travel services for its ... the first in the United States and Europe to offer travel management services specifically ...
(Date:3/29/2017)... ... ... Bactana Animal Health, a company developing natural products aimed at reducing the ... gut microbiota, today announced the closing of its first round of funding. , ... Management, LLC and a number of private investors. The company will use the financing ...
(Date:3/29/2017)... March 29, 2017 /PRNewswire/ - The University of Missouri ... a business of Sterigenics International, and General Atomics (GA), ... submitted to the U.S. Nuclear Regulatory Commission (NRC). This ... of molybdenum-99 (Mo-99). Once operational, production from this facility ... demand for Mo-99, which currently must be imported from ...
(Date:3/29/2017)... The Global Microfluidic Chips Market by Manufacturers, Countries, Type and ... on the existing state of the global Microfluidic Chips industry especially ... and Asia-Pacific , South America ... Africa . ... Browse 172 Tables and Figures, 13 Major Company Profiles, spread across ...
Breaking Biology Technology: