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Related Concept Videos

Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

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...
Net Torque Calculations01:19

Net Torque Calculations

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 rotate...
Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the shaft's...
Self-Locking Screw01:16

Self-Locking Screw

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.

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Related Experiment Video

Updated: Jun 3, 2026

Mechano-Node-Pore Sensing: A Rapid, Label-Free Platform for Multi-Parameter Single-Cell Viscoelastic Measurements
05:49

Mechano-Node-Pore Sensing: A Rapid, Label-Free Platform for Multi-Parameter Single-Cell Viscoelastic Measurements

Published on: December 2, 2022

Single-period readout self-resetting silk torque sensor.

Shivali Sokhi, Priya Yadav, Amarnath Amarnath

    Optics Letters
    |June 1, 2026
    PubMed
    Summary
    This summary is machine-generated.

    We developed a fast, self-resetting optical torque sensor using a silk fiber torsion pendulum. This allows for sensitive, time-resolved measurements of attonewton-meter level torques within seconds.

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    Published on: May 19, 2014

    Area of Science:

    • Optomechanics
    • Nanoscale force sensing
    • Materials science

    Background:

    • Torsion pendulums provide high torque sensitivity but are slow.
    • Time-resolved measurements are limited by slow response times.

    Purpose of the Study:

    • To develop a rapid, self-resetting optical torque sensor.
    • To enable sensitive, time-resolved measurements of small torques.

    Main Methods:

    • Utilized a silk fiber torsion pendulum in ultra-high vacuum.
    • Implemented a single-period, non-resonant, time-domain measurement approach.
    • Leveraged intrinsic mechanical relaxation for self-resetting.

    Main Results:

    • Achieved attonewton-meter level torque detection within seconds.
    • Demonstrated measurements without high quality factors or active damping.
    • Validated using laser-induced radiation pressure torque.
    • Measured solar radiation pressure.

    Conclusions:

    • The developed sensor offers a compact platform for dynamic optomechanical force sensing.
    • This method overcomes the speed limitations of traditional torsion pendulums.
    • Enables new possibilities for time-resolved nanoscale force measurements.