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Related Concept Videos

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...
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...
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...
Rolling With Slipping01:14

Rolling With Slipping

Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can affect...
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
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Published on: December 24, 2014

Frictional duality observed during nanoparticle sliding.

Dirk Dietzel1, Claudia Ritter, Tristan Mönninghoff

  • 1Physikalisches Institut and Center for Nanotechnology (CeNTech), Westfälische Wilhelms-Universität Münster, Münster, Germany.

Physical Review Letters
|October 15, 2008
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Summary

Nanoparticle friction experiments reveal two states: some show increasing friction with area, while others slide frictionlessly. Surface contamination may explain this observed duality in nanoscale friction.

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Area of Science:

  • Tribology
  • Nanotechnology
  • Surface Science

Background:

  • Understanding nanoscale friction is crucial for predicting material behavior at small scales.
  • The area dependence of friction is a fundamental, yet debated, topic in tribology.

Purpose of the Study:

  • To investigate the area dependence of friction for nanoparticles at the nanoscale.
  • To identify different frictional states and their underlying mechanisms.

Main Methods:

  • Utilized atomic force microscopy (AFM) to measure frictional resistance.
  • Employed AFM tip to push individual nanoparticles across a surface.
  • Varied interface areas up to 310,000 nm².

Main Results:

  • Observed two distinct frictional states: finite friction and frictionless sliding.
  • Finite friction increased linearly with interface area for some nanoparticles.
  • Frictionless sliding was observed for other nanoparticles, suggesting a different interaction mechanism.

Conclusions:

  • Nanoparticle friction exhibits a duality, with distinct states coexisting.
  • Surface contamination appears to be linked to the observed frictional duality.
  • Further research is needed to fully elucidate the mechanisms governing these nanoscale frictional behaviors.