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Related Concept Videos

Frictional Force01:07

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 Friction01:30

Dry Friction

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...
Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

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...
Characteristics of Dry Friction01:21

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.
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...
Types of Friction Problems01:27

Types of Friction Problems

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.
Kinetic Friction01:26

Kinetic Friction

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 begins...

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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
13:57

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

Published on: December 24, 2014

Sliding friction at soft micropatterned elastomer interfaces.

Elise Degrandi-Contraires1, Christophe Poulard, Frédéric Restagno

  • 1Laboratoire de Physique des Solides, Universitd Paris-Sud & CNRS, Bdt. 510 - Campus universitaire d'Orsay, F-91405 Orsay cedex, France.

Faraday Discussions
|January 5, 2013
PubMed
Summary
This summary is machine-generated.

Friction between elastomer lenses and patterned surfaces was studied. Higher friction was observed on micropatterned surfaces due to elastic deformations, impacting energy dissipation.

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Area of Science:

  • Materials Science
  • Tribology
  • Soft Matter Physics

Background:

  • Understanding friction is crucial for designing advanced materials and devices.
  • Elastomer friction is complex, influenced by surface topography and elastic properties.
  • Micropatterning offers a route to tune surface interactions and tribological behavior.

Purpose of the Study:

  • To experimentally investigate the friction between a smooth elastomer lens and a micropatterned elastomer substrate.
  • To analyze friction forces in different contact regimes (full contact and top contact).
  • To elucidate the role of elastic deformations in friction dissipation processes on patterned surfaces.

Main Methods:

  • Experimental friction measurements using a smooth elastomer lens and a substrate with hexagonal arrays of cylindrical pillars.
  • Varying normal loads to achieve different contact states (full and mixed contact).
  • Analysis of friction forces and stresses in relation to contact mechanics.

Main Results:

  • Friction behavior depends on the normal load, leading to distinct contact regimes.
  • Friction stresses in the top contact zone were found to be higher than on smooth surfaces.
  • Elastic deformations of the elastomer surfaces significantly contribute to energy dissipation during friction.

Conclusions:

  • Micropatterned elastomer surfaces exhibit unique friction characteristics compared to smooth surfaces.
  • Elastic deformations play a key role in the energy dissipation mechanisms governing elastomer friction.
  • This study provides insights into controlling friction in soft materials through surface engineering.