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Related Concept Videos

Frictional Force01:07

Frictional Force

8.8K
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...
8.8K
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....
673
Dry Friction01:30

Dry Friction

523
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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Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

19.2K
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.
However, if two systems are in contact and are stationary relative to one...
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Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

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Atomistic observation on diffusion-mediated friction between single-asperity contacts.

Yang He1, Dingshun She1,2, Zhenyu Liu1

  • 1Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA, USA.

Nature Materials
|October 8, 2021
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Summary
This summary is machine-generated.

Researchers directly observed nanoscale friction using in situ electron microscopy. A unique interfacial layer formed between metallic contacts, enabling low friction under tension but high friction under compression, revealing atomic diffusion

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Area of Science:

  • Nanoscale science
  • Tribology
  • Materials science

Background:

  • Nanotribology research is limited by the inability to directly observe sliding interfaces.
  • Existing atomic force microscopy techniques provide indirect or ex situ surface characterization, leading to interpretative challenges.

Purpose of the Study:

  • To directly observe and understand atomic-scale interfacial structures during nanoscale frictional processes.
  • To investigate the role of atomic diffusion in the friction of metallic contacts.

Main Methods:

  • Combined in situ high-resolution transmission electron microscopy (HRTEM) and atomic force microscopy (AFM).
  • Utilized molecular dynamics (MD) simulations for corroboration.

Main Results:

  • Discovered the formation of a loosely packed interfacial layer between metallic asperities under tensile stress, resulting in low friction.
  • Observed the transformation of this layer into an ordered structure under compressive stress, leading to high, dissipative friction.

Conclusions:

  • Direct real-time observation of interfacial dynamics is crucial for understanding nanotribology.
  • Atomic diffusion plays a significant role in modulating friction in metallic contacts.
  • The stress state dictates the interfacial layer structure and its impact on friction.