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

Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

4.1K
The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
4.1K
Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

283
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...
283
Torque Free Motion01:15

Torque Free Motion

493
The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
493
Net Torque Calculations01:19

Net Torque Calculations

9.2K
When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...
9.2K
Power Expended by a Constant Force00:57

Power Expended by a Constant Force

7.6K
The relationship between work done and the time taken to do it can be explained using the concept of power. For example, several sprinters in a race may have the same velocity when they reach the finish line, therefore doing the same amount of work, but the winner does it in the least amount of time. Thus, power is defined as the rate of doing work. Since work can vary as a function of time, the average power is defined as the work done during a time interval, divided by the time interval.
7.6K
Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

295
Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
295

You might also read

Related Articles

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

Sort by
Same author

Plant nutation relies on steady propagation of spatially asymmetric growth pattern.

Quantitative plant biology·2025
Same author

Young's modulus of multinanolayer polymer films: the role of the interfaces.

Soft matter·2025
Same author

Emergence of tip singularities in dissolution patterns.

Proceedings of the National Academy of Sciences of the United States of America·2023
Same author

Metagenomic analysis of pioneer biofilm-forming marine bacteria with emphasis on Vibrio gigantis adhesion dynamics.

Colloids and surfaces. B, Biointerfaces·2022
Same author

Fast adaptation of cooperative channels engenders Hopf bifurcations in auditory hair cells.

Biophysical journal·2022
Same author

Streamwise Dissolution Patterns Created by a Flowing Water Film.

Physical review letters·2020

Related Experiment Video

Updated: Jul 11, 2025

Method to Measure Tone of Axial and Proximal Muscle
10:41

Method to Measure Tone of Axial and Proximal Muscle

Published on: December 14, 2011

17.6K

Traveling Perversion as Constant Torque Actuator.

Émilien Dilly1, Sébastien Neukirch2, Julien Derr3

  • 1Laboratoire Matière et Systèmes Complexes, UMR 7057, Université Paris Cité, CNRS, F-75205 Paris Cedex 13, France.

Physical Review Letters
|November 13, 2023
PubMed
Summary
This summary is machine-generated.

This study reveals how helical elastic rods change shape when unwound, transitioning through natural, mixed, and inverted states. A key finding is the traveling "perversion" or helicity inversion, crucial for understanding these topological phenomena.

More Related Videos

Fabrication of Soft Pneumatic Network Actuators with Oblique Chambers
07:09

Fabrication of Soft Pneumatic Network Actuators with Oblique Chambers

Published on: August 17, 2018

9.1K
Modeling and Experimental Analysis of the Single-Shaft Coaxial Motor-Pump Assembly in Electrohydrostatic Actuators
08:59

Modeling and Experimental Analysis of the Single-Shaft Coaxial Motor-Pump Assembly in Electrohydrostatic Actuators

Published on: June 13, 2022

2.6K

Related Experiment Videos

Last Updated: Jul 11, 2025

Method to Measure Tone of Axial and Proximal Muscle
10:41

Method to Measure Tone of Axial and Proximal Muscle

Published on: December 14, 2011

17.6K
Fabrication of Soft Pneumatic Network Actuators with Oblique Chambers
07:09

Fabrication of Soft Pneumatic Network Actuators with Oblique Chambers

Published on: August 17, 2018

9.1K
Modeling and Experimental Analysis of the Single-Shaft Coaxial Motor-Pump Assembly in Electrohydrostatic Actuators
08:59

Modeling and Experimental Analysis of the Single-Shaft Coaxial Motor-Pump Assembly in Electrohydrostatic Actuators

Published on: June 13, 2022

2.6K

Area of Science:

  • Mechanics of Materials
  • Soft Matter Physics
  • Topological Mechanics

Background:

  • Helical elastic rods are fundamental structures in various scientific and engineering fields.
  • Understanding their mechanical response under torsional stress is crucial for designing advanced materials and devices.

Purpose of the Study:

  • To investigate the mechanical stress and conformational changes of helical elastic rods during unwinding.
  • To characterize the distinct states (natural, mixed, inverted helix) and the phenomenon of helicity inversion.

Main Methods:

  • Axial rotation of clamped helical rods to alter winding number while maintaining fixed elongation.
  • Monitoring applied torque (M) and tension (T) throughout the unwinding process.
  • Utilizing a biphasic model and numerical simulations based on Kirchhoff theory for quantitative description.

Main Results:

  • Identified three distinct states: natural helix (+), mixed state (+/-), and inverted helix (-).
  • Observed the nucleation, travel, and annihilation of a 'perversion' (helicity inversion) during the transition.
  • The mixed state exhibits a nearly constant torque, acting as a constant torque actuator.

Conclusions:

  • The study quantitatively describes the behavior of helical rods using a biphasic model and numerical simulations.
  • Traveling perversions and topological phenomena in these systems are universal.
  • Findings have broad applications in condensed matter, biological systems, and soft robotics.