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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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Characteristics of Dry Friction01:21

Characteristics of Dry Friction

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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.
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
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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.
The first type of dry friction problem involves situations where there is no apparent impending motion....
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Dry Friction01:30

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.
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
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Major Losses in Pipes01:28

Major Losses in Pipes

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When a fluid flows through a pipe, it experiences energy losses due to frictional resistance along the pipe walls, known as major losses. These energy losses result in a pressure drop, which varies based on the flow conditions — whether laminar or turbulent — and the specific physical properties of the fluid and pipe.
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to...
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Kinetic Friction01:26

Kinetic Friction

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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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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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From Molecular to Multiasperity Contacts: How Roughness Bridges the Friction Scale Gap.

Lucas Frérot1,2, Alexia Crespo3, Jaafar A El-Awady2

  • 1Department of Physics and Astronomy, Johns Hopkins University, 3400 N. Charles Street, Baltimore, Maryland21218, United States.

ACS Nano
|January 23, 2023
PubMed
Summary
This summary is machine-generated.

Frictional interfaces strengthen over time due to structural changes. This study reveals how surface roughness and molecular motion in adsorbed monolayers govern this "structural aging" and control friction dynamics.

Keywords:
contact junctionfatty acid monolayersfrictionresponseroughnesstransient

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Area of Science:

  • Tribology
  • Materials Science
  • Surface Chemistry

Background:

  • Frictional interfaces can strengthen over time under constant load due to aging processes like creep or chemical/structural changes.
  • Current macroscopic models use an ad hoc state variable to represent these complex frictional aging phenomena.

Purpose of the Study:

  • To elucidate the mechanisms of structural aging in frictional systems.
  • To explain how macroscopic friction emerges from the interplay of surface roughness and molecular motion in adsorbed monolayers.
  • To investigate the role of contact junctions and their dynamics in friction.

Main Methods:

  • Coupled experimental and computational approaches were employed.
  • Experiments provided detailed measurements of friction force decay over nanometer sliding distances.
  • Computational methods demonstrated the link between memory distance and the evolution of intermolecular physical links within contact junctions.

Main Results:

  • Surface roughness is identified as a sufficient condition for structural aging.
  • A unified model for friction between rough adsorbed monolayers was developed.
  • Contact junctions are shown to be crucial for structural aging.
  • Infrajunction molecular motion dictates the macroscopic friction response.

Conclusions:

  • The study provides a molecular-level understanding of structural aging in frictional interfaces.
  • The interplay between surface roughness, molecular motion, and contact junctions governs friction dynamics.
  • This research offers insights into controlling friction through surface and molecular engineering.