Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

287
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
287
Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

273
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...
273
Rolling Without Slipping01:09

Rolling Without Slipping

3.6K
People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is...
3.6K
Mechanism of Ciliary Motion01:05

Mechanism of Ciliary Motion

3.7K
The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
3.7K
Journal Bearings01:23

Journal Bearings

670
Journal bearings are mechanical components that support and provide lateral stability to rotating shafts and axles. They are crucial in reducing friction, wear, and vibration in machinery such as engines, turbines, and pumps. The principle behind journal bearings is forming a thin lubricant film between the bearing surface and the rotating shaft, which minimizes direct contact and reduces frictional forces.
To better understand the concept of journal bearings, consider a rope winch with dry or...
670
Statically Indeterminate Problem Solving01:16

Statically Indeterminate Problem Solving

378
Statically indeterminate problems are those where statics alone can not determine the internal forces or reactions. Consider a structure comprising two cylindrical rods made of steel and brass. These rods are joined at point B and restrained by rigid supports at points A and C. Now, the reactions at points A and C and the deflection at point B are to be determined. This rod structure is classified as statically indeterminate as the structure has more supports than are necessary for maintaining...
378

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Bacteria harness torque-induced buckling instability for flagellar wrapping.

Physical review. E·2026
Same author

Linear Force Scaling in Kinesin-Driven Microtubule Swarms Revealed by Electromagnetic Tweezers.

ACS nano·2026
Same author

Wrinkles, rucks, and folds formed in a heavy sheet on a frictional surface.

Soft matter·2026
Same author

Bacteria break through one-micrometer-square passages by flagellar wrapping.

Nature communications·2026
Same author

Indentation of an elastic arch on a frictional substrate: Pinning, unfolding, and snapping.

Physical review. E·2024
Same author

Formations of force network and softening of amorphous elastic materials from a coarsen-grained particle model.

Scientific reports·2024

Related Experiment Video

Updated: Jul 2, 2025

Rod-based Fabrication of Customizable Soft Robotic Pneumatic Gripper Devices for Delicate Tissue Manipulation
07:49

Rod-based Fabrication of Customizable Soft Robotic Pneumatic Gripper Devices for Delicate Tissue Manipulation

Published on: August 2, 2016

8.8K

How a Soft Rod Wraps around a Rotating Cylinder.

Marie Tani1,2, Hirofumi Wada3

  • 1Department of Physics, Tokyo Metropolitan University, Hachioji-City, Tokyo 192-0397, Japan.

Physical Review Letters
|February 16, 2024
PubMed
Summary

Researchers studied how flexible rods form shapes around a rotating cylinder. They identified three distinct morphologies, providing insights into soft materials and bio-inspired designs.

More Related Videos

Operation of the Collaborative Composite Manufacturing CCM System
10:09

Operation of the Collaborative Composite Manufacturing CCM System

Published on: October 1, 2019

6.6K
Design and Fabrication of an Elastomeric Unit for Soft Modular Robots in Minimally Invasive Surgery
11:06

Design and Fabrication of an Elastomeric Unit for Soft Modular Robots in Minimally Invasive Surgery

Published on: November 14, 2015

9.0K

Related Experiment Videos

Last Updated: Jul 2, 2025

Rod-based Fabrication of Customizable Soft Robotic Pneumatic Gripper Devices for Delicate Tissue Manipulation
07:49

Rod-based Fabrication of Customizable Soft Robotic Pneumatic Gripper Devices for Delicate Tissue Manipulation

Published on: August 2, 2016

8.8K
Operation of the Collaborative Composite Manufacturing CCM System
10:09

Operation of the Collaborative Composite Manufacturing CCM System

Published on: October 1, 2019

6.6K
Design and Fabrication of an Elastomeric Unit for Soft Modular Robots in Minimally Invasive Surgery
11:06

Design and Fabrication of an Elastomeric Unit for Soft Modular Robots in Minimally Invasive Surgery

Published on: November 14, 2015

9.0K

Area of Science:

  • Physics
  • Materials Science
  • Soft Robotics

Background:

  • Helical coils are essential in nature and technology, particularly for soft machines like artificial muscles and grippers.
  • The stability of helical coils depends on material properties and system geometry.

Purpose of the Study:

  • To investigate the morphologies formed by a flexible, heavy rod wrapping around a rotating rigid cylinder.
  • To provide a physical understanding of ordered morphology in soft threads and rods.

Main Methods:

  • Experimental observation of rod morphologies.
  • Theoretical analysis using geometrically nonlinear Kirchhoff rod theory.
  • Numerical simulations to rationalize experimental findings.

Main Results:

  • Identified three distinct morphologies: tight coiling, helical wrapping, and no wrapping.
  • Demonstrated that rod shape is governed by bending elasticity, gravity, and system geometry, even with friction.
  • Provided a comprehensive physical model for the observed phenomena.

Conclusions:

  • The study offers a fundamental understanding of how flexible rods form ordered structures.
  • Findings have implications for bacterial motility and the design of soft robotic grippers.