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Related Concept Videos

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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.
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When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
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In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
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For incompressible Newtonian fluids, where density remains constant, stresses show a linear relationship with the deformation rate, defined by normal and shear stresses. Normal stresses depend on the pressure exerted on the fluid and the rate of deformation in specific directions, which determines how fluid flows under varying pressures. Shear stresses, on the other hand, act tangentially across fluid layers. They explain how adjacent fluid layers slide relative to one another, connecting...
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When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
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Fluctuation-Induced Forces in Nonequilibrium Diffusive Dynamics.

Avi Aminov1, Yariv Kafri1, Mehran Kardar2

  • 1Department of Physics, Technion, Haifa 32000, Israel.

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Summary
This summary is machine-generated.

Fluctuations in nonequilibrium systems create forces on embedded objects. These forces depend on system dynamics, unlike equilibrium forces, and can be attractive or repulsive.

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Area of Science:

  • Statistical Mechanics
  • Soft Matter Physics
  • Condensed Matter Physics

Background:

  • Non-equilibrium steady states (NESS) exhibit fluctuations that influence system properties.
  • Conserved quantities in NESS typically show power-law decay of correlations.
  • Objects embedded in fluctuating environments can experience forces due to these fluctuations.

Purpose of the Study:

  • To compute fluctuation-induced forces on embedded bodies in a driven diffusive system.
  • To analyze the dependence of these forces on system parameters like slab separation and dynamics.
  • To compare these non-equilibrium forces with equilibrium forces, such as the Casimir force.

Main Methods:

  • Modeling parallel slabs within a driven diffusive system.
  • Calculating fluctuation-induced forces as a function of slab separation (d).
  • Analyzing the force's dependence on temperature (T) and spatial dimensions.

Main Results:

  • The computed force decays as kBT/d with slab separation, irrespective of spatial dimensions.
  • The force can be either attractive or repulsive.
  • The force amplitude is non-universal and explicitly depends on the system's dynamics.

Conclusions:

  • Fluctuation-induced forces in NESS are distinct from equilibrium forces like the Casimir force due to their dependence on dynamics.
  • The presented techniques are applicable to a wider range of non-equilibrium systems for studying forces and pressures.
  • Understanding these forces is crucial for systems driven far from equilibrium.