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:3/29/2017)...  higi, the health IT company that operates the ... , today announced a Series B investment from ... The new investment and acquisition accelerates higi,s strategy to ... population health activities through the collection and workflow integration ... collects and secures data today on behalf of over ...
(Date:3/24/2017)... Research and Markets has announced the addition of the ... Industry Forecast to 2025" report to their offering. ... The Global Biometric Vehicle Access ... 15.1% over the next decade to reach approximately $1,580 million by ... and forecasts for all the given segments on global as well ...
(Date:3/22/2017)... 21, 2017 Optimove , provider ... retailers such as 1-800-Flowers and AdoreMe, today announced ... and Replenishment. Using Optimove,s machine learning algorithms, these ... and replenishment recommendations to their customers based not ... of customer intent drawn from a complex web ...
Breaking Biology News(10 mins):
(Date:8/21/2017)... ... August 21, 2017 , ... ... Island of Hawaii, is pleased to announce the first Delos Wellness Signature™ residence ... Sotheby’s International Realty is working together with listing agent Kelly Allen, R(S) of ...
(Date:8/21/2017)... Baltimore, Maryland (PRWEB) , ... August 21, 2017 ... ... has partnered with a leading Chinese bio security firm, to bring its proprietary ... As part of the relationship, the Chinese firm has purchased an undisclosed ...
(Date:8/21/2017)... Linda, Ca (PRWEB) , ... August 21, 2017 ... ... has arranged for two speakers for this two-part educational webinar, in which attendees ... complex subunit, and associated protein factor composition. Along with an overview of the ...
(Date:8/18/2017)... ... August 18, 2017 , ... Producers of ... Federal Hybrids, Inc. in an upcoming episode, scheduled to broadcast fourth quarter 2017. ... explore Federal Hybrids, the independent, family-owned seed company. Educating audiences about its broad ...
Breaking Biology Technology: