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Frictional Force

Frictional Force

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...

Dry Friction

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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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Characteristics of Dry Friction

Characteristics of Dry Friction

Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
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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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Contact Angle

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When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
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Consider a truck trying to pull a stationary car. As the truck exerts a force on the car, static friction is created at the point of contact between the two surfaces. This frictional force resists the car's movement and keeps it at rest. However, when the applied force by the truck surpasses the limiting static frictional force, an interesting phenomenon occurs. The frictional force at the interface reduces to a lower value, known as the kinetic frictional force. At this point, the car...

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Related Experiment Video

Updated: Oct 29, 2025

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

Published on: December 24, 2014

Improved methodology to compute the intrinsic friction coefficient at solid-liquid interfaces.

Sleeba Varghese¹, J S Hansen², B D Todd¹

¹Department of Mathematics, School of Science, Swinburne University of Technology, Melbourne, Victoria 3122, Australia.

The Journal of Chemical Physics

|July 9, 2021

Summary

This summary is machine-generated.

We present a new method to calculate liquid-solid interfacial friction, reducing statistical errors. This approach isolates wall-fluid interactions for more accurate intrinsic friction coefficient measurements.

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Area of Science:

Computational physics
Materials science
Physical chemistry

Background:

The liquid-solid (L-S) interface governs friction in many systems.
Existing methods for calculating interfacial friction have limitations, including statistical errors and bulk fluid contributions.

Purpose of the Study:

To develop an improved methodology for computing the intrinsic friction coefficient at the L-S interface.
To reduce statistical errors and eliminate bulk fluid contributions in friction coefficient calculations.

Main Methods:

Utilized equilibrium molecular dynamics simulations.
Applied an improved theoretical model based on Hansen et al. [Phys. Rev. E 84, 016313 (2011)].
Focused calculations on interfacial particles to isolate wall-fluid interactions.

Main Results:

The new method demonstrated smaller statistical errors compared to the original Hansen et al. procedure.
Calculated interfacial friction solely from wall-fluid interactions, excluding bulk fluid effects.
Validated the intrinsic nature of the friction coefficient across various interfaces, channel sizes, and against non-equilibrium molecular dynamics.

Conclusions:

The improved methodology offers a more reliable approach to determining intrinsic interfacial friction.
This method overcomes convergence and correlation-time ambiguities inherent in Green-Kubo-like formulations.
Provides a robust tool for understanding and predicting friction at liquid-solid interfaces.