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:4/1/2015)...   Medisafe ™, the leading global medication management ... and Android smartphones and tablets, announces ... platform to allow patients to track and correlate their ... patients will be able to visualize in real-time how ... such as glucose levels and blood pressure. ...
(Date:3/30/2015)... Mar. 26, 2015 Research and Markets ... "Global Gesture Recognition Market in Automotive Sector 2014-2018" ... forecast the Global Gesture Recognition market in Automotive Sector ... period 2013-2018. Gesture recognition is the ability ... gestures of an individual. Gesture recognition technology can be ...
(Date:3/24/2015)... --Research and Markets ( http://www.researchandmarkets.com/research/kvdtcw/face_and_voice ) has announced the ... Business Report" report to their offering. This report ... Thousands by the following Segments: Face Biometrics, and Voice Biometrics. The ... , Japan , Europe ... & Africa , and Latin ...
Breaking Biology News(10 mins):Medisafe Announces Launch of Biometric Integration, Enabling Patients to Stay Adherent to Their Meds and See Tangible Health Results 2Global Gesture Recognition Market in Automotive Sector Report 2015 - Growing Number of Partnerships 2Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 2Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 3Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 4Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 5Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 6
... NY, November 20, 2012Mary Ann Liebert, Inc., publishers ... journal dedicated to the science and engineering of soft materials ... first to answer the urgent need for research on robotic ... in complex natural or human-built environments. Soft Robotics ...
... during cardiac surgery can lead to convulsive seizures, but ... research from the Faculty of Medicine at the University ... trauma surgery are often given tranexamic acid (TXA) and ... of Medicine researchers found these drugs are associated with ...
... atomic physics over the past few years are methods that ... temperatures just above absolute zero. Scientists from Bangalore and Mainz ... also be cooled through contact with cold atoms and may ... condition for longer periods of time. This finding runs counter ...
Cached Biology News:'Soft Robotics': A groundbreaking new journal on engineered soft devices that Interact with Living Systems 2Seizures linked to surgery drugs can be prevented by anesthetics, U of T team finds 2Scientists from Bangalore and Mainz develop new methods for cooling of ions 2
(Date:5/5/2015)... , May 5, 2015 Reprints Desk, Inc., ... providing on-demand access to scientific, technical and medical (STM) ... the Association of Southeastern Research Libraries (ASERL) . ... libraries located across 11 southeastern states. Founded in 1956, ... collaborative programs to address the continually changing needs of ...
(Date:5/5/2015)... , May 05, 2015 Research and Markets ... addition of the "Clinical Laboratory, Molecular Diagnostics ... 2015 to 2019 - Global Version" report ... especially in the area of molecular diagnostics and ... and evolving world market that is moving out ...
(Date:5/5/2015)... 2015 Exotic Automation & ... the launch of http://www.cng.exoticautomation.com , an ecommerce ... convenient way to purchase genuine OEM replacement CNG, ... , The new website provides owners of fleets ... access to high performance products for their vehicle ...
(Date:5/4/2015)... YORK , May 4, 2015 ... for granted. But for certain infants with rare, ... death are stark consequences of their impaired immune ... Medical Center have identified an important role for ... resulting from Mycobacterium tuberculosis, the bacterium causing tuberculosis ...
Breaking Biology Technology:Association of Southeastern Research Libraries Partners with Reprints Desk to Improve Access for Hard-to-Find Materials 2Association of Southeastern Research Libraries Partners with Reprints Desk to Improve Access for Hard-to-Find Materials 3Association of Southeastern Research Libraries Partners with Reprints Desk to Improve Access for Hard-to-Find Materials 4Global Clinical Laboratory, Molecular Diagnostics and Genomic Testing Services Market Trends and Forecast 2015 to 2019 2Exotic Automation & Supply Launches Ecommerce Website 2Researchers Discover A Novel And Unexpected Role For Calcium In Controlling Inflammation During Chronic Lung Infection 2Researchers Discover A Novel And Unexpected Role For Calcium In Controlling Inflammation During Chronic Lung Infection 3
... Nanotechnology Victoria (NanoVic) and AZoNetwork are pleased to ... in a Podcast format. , This third Podcast ... features key stakeholders discussing the crucial issues around ... development and translated into successful commercial outcomes. , Dr ...
... Bulletin Board: CNVT) holding BIOREM announced the,receipt of a ... a,Biofiltair odor control system. This order for $280,000 (Cdn) ... is the third order,received from China over the past ... was accepted on these projects,",said Peter Bruijns, President and ...
... RDEA ) today announced that its President and ... the "In Search of the,Next HIV Treatment" panel discussion ... December 12, 2007 at 1:30 p.m. (ET) at,the Westin ... audio webcast of the,presentation and panel discussion will be ...
Cached Biology Technology:Commercialization of nanotechnology 2CVF Technologies Corporation's Holding - BIOREM Announces 3rd Order from China 2Ardea Biosciences to Participate in RBC Capital Markets 2007 Healthcare Conference 2Ardea Biosciences to Participate in RBC Capital Markets 2007 Healthcare Conference 3
... 21 CFR part 11, Compliant software for JASCO HPLC systems. ... ... number of control software options for JASCO HPLC systems. This provides ... and record all instrument settings with each run. , ...
Rabbit anti Xanthine Oxidase Xanthine Oxidase, Bovine Buttermilk...
... Introducing SilverSNAP Stain for Mass Spectrometry Applications ... mass spectrometry (MS) has emerged as a ... staining of 2-D gels is now an ... procedures that leads ultimately to identification of ...
... Mammalian Protein Extraction Reagent is ... solution that means no scraping, ... sonication! With M-PER Reagent, rapid ... minutes at room temperature, yielding ...
Biology Products: