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Related Concept Videos

Frictional Force01:07

Frictional Force

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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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Correlation of Experimental Data01:23

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Dimensional analysis simplifies complex physical problems and guides experimental investigations, but it does not provide complete solutions. It identifies the dimensionless groups that influence a phenomenon, but experimental data is needed to establish the specific relationships and validate theoretical predictions.
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Static and Kinetic Frictional Force01:05

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One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
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Types of Friction Problems01:27

Types of Friction Problems

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Friction is an essential concept in physics, engineering, and everyday life. It is the force that opposes the relative motion or tendency of such motion between two surfaces in contact. One of the most common types of friction encountered in various applications is dry friction. Dry friction problems can be broadly categorized into three types, each with unique characteristics and challenges.
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Dry Friction01:30

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Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
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Drag01:23

Drag

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Drag is a resistive force opposing an object’s motion through a fluid, resulting from surface pressure and shear forces. It comprises two components: a perpendicular one from pressure and a tangential one from shear stress. Accurate drag calculations use pressure and wall shear stress distributions, often determined through Computational Fluid Dynamics (CFD) or wind tunnel testing. The drag coefficient, a dimensionless measure, depends on factors like shape, Reynolds number, Mach number,...
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The Diffusion of Passive Tracers in Laminar Shear Flow
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Diffusion and friction from force correlations.

Henrik Kiefer1, Benjamin A Dalton1, Roland R Netz1

  • 1Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.

The Journal of Chemical Physics
|May 22, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new method to accurately calculate molecular friction and diffusion, overcoming limitations of previous approaches. The method works reliably even for small systems and helps understand how different forces contribute to molecular motion.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Materials Science

Background:

  • Solute-solvent interactions and their resulting friction are crucial for molecular dynamics in liquids, affecting processes from diffusion to protein folding.
  • Traditional methods like the fluctuation-dissipation relation are complex for interfacial systems, while approximate force autocorrelation function (FACF) methods suffer from the plateau problem, especially in small systems.

Purpose of the Study:

  • To develop an exact integral method based on the force autocorrelation function (FACF) that overcomes the plateau problem for accurate friction estimation.
  • To provide a robust framework for calculating friction and diffusivity in molecular simulations, particularly for small systems and interfacial phenomena.

Main Methods:

  • Developed an exact integral method utilizing the force autocorrelation function (FACF) to address the limitations of existing friction calculation techniques.
  • Validated the new method using molecular dynamics simulations of molecular diffusion in SPC/E water.
  • Applied the method to decompose diffusivity contributions from electrostatic and Lennard-Jones forces.

Main Results:

  • The novel FACF-based integral method demonstrates robust convergence and accurately determines friction and diffusivity coefficients, even for small molecular systems.
  • The approach successfully eliminates the plateau problem inherent in previous FACF-based friction estimations.
  • The method allows for the detailed analysis of how different microscopic forces (electrostatic and Lennard-Jones) contribute to molecular diffusion.

Conclusions:

  • The developed exact integral method offers a reliable framework for estimating molecular friction and diffusivity from simulations.
  • This approach enhances our understanding of dissipative effects stemming from microscopic forces at interfaces and in bulk liquids.
  • The findings are significant for accurately modeling molecular dynamics and interfacial phenomena in various chemical and biological systems.