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Non-conservative Forces01:17

Non-conservative Forces

Non-conservative forces are dissipative forces such as friction or air resistance. These forces take energy away from a system as it progresses. Unlike conservative forces, non-conservative forces do not have potential energy associated with them. This is because the energy is lost to the system and cannot be turned into useful work later.
Also unlike their conservative counterparts, they are path-dependent; where the object starts and stops does matter. For example, a grinding wheel applies a...
Constraints and Statical Determinacy01:26

Constraints and Statical Determinacy

In structural engineering, the equilibrium of a system is not only determined by its equations of equilibrium but also with the help of constraints. Constraints refer to restrictions on the motion of a system. The proper combinations of constraints can minimize the total number of constraints needed to maintain a system in mechanical equilibrium. When this happens, the system is said to be statically determinate. For such systems, the unknown reaction supports can be estimated using equilibrium...
Forces Acting on Chromosomes02:11

Forces Acting on Chromosomes

During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis. 
Microtubules and motor proteins exert two types of forces on...
Forces Acting on Chromosomes02:11

Forces Acting on Chromosomes

During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis. 
Microtubules and motor proteins exert two types of forces on...
Simplification of a Force and Couple System: II01:23

Simplification of a Force and Couple System: II

In a three-dimensional system, multiple forces can act on an object. These forces can be combined into a single equivalent force, known as the resultant force. Similarly, the moments generated by these forces can be combined into a single equivalent moment, the resultant couple moment. In certain situations, these two entities may not be mutually perpendicular, meaning they do not have a 90-degree angle between them. This unique condition requires a deeper understanding of the interplay between...
Mechanism of Ciliary Motion01:05

Mechanism of Ciliary Motion

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...

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Related Experiment Video

Updated: Jun 3, 2026

Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
08:48

Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers

Published on: October 13, 2011

Improved constraints on an axion-mediated force.

S A Hoedl1, F Fleischer, E G Adelberger

  • 1Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195-4290, USA. sethh@uw.edu

Physical Review Letters
|March 17, 2011
PubMed
Summary

Researchers searched for axion-like particles mediating new forces. Using a novel torsion pendulum, they significantly improved laboratory bounds on these forces, constraining pseudoscalar particles across astrophysically relevant masses.

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Last Updated: Jun 3, 2026

Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
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Area of Science:

  • Particle Physics
  • Astrophysics
  • Fundamental Symmetries

Background:

  • Low mass pseudoscalars, like the axion, are theorized to mediate forces violating parity and time-reversal symmetries.
  • Searching for such exotic forces probes beyond the Standard Model of particle physics.
  • These forces could have implications for cosmology and astrophysics.

Purpose of the Study:

  • To search for macroscopic parity and time-reversal symmetry-violating forces mediated by low mass pseudoscalars.
  • To improve existing laboratory constraints on the properties of axion-like particles.
  • To explore a broad range of particle masses relevant to astrophysical phenomena.

Main Methods:

  • Utilized a novel, magnetically unshielded torsion pendulum to detect subtle forces.
  • Employed polarized electrons and unpolarized atoms as the source and target for the potential force.
  • Performed high-precision measurements to enhance sensitivity to weak interactions.

Main Results:

  • Improved laboratory bounds on pseudoscalar-mediated forces by over 10 orders of magnitude for masses above 1 meV.
  • Constrained these forces across a wide range of astrophysically interesting masses, from 10 μeV to 10 meV.
  • Established new, stringent limits on axion-like particle interactions with ordinary matter.

Conclusions:

  • The experiment provides the most stringent laboratory constraints to date on certain axion-like particle models.
  • The results significantly narrow the parameter space for pseudoscalar particles mediating macroscopic forces.
  • This work opens new avenues for searching for new physics beyond the Standard Model using precision measurements.