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Related Concept Videos

Static Friction01:18

Static Friction

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Static friction is a force that opposes the relative motion or tendency of motion between two surfaces in contact. It plays a crucial role in our daily lives, from walking on the ground to driving a car.
For example, consider a scenario where a truck is connected to a car by a rope, ready to tow it along a road. When no external force is applied by the truck, the car remains stationary and is said to be in static equilibrium. In this case, the forces acting on the car, such as gravity and the...
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Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

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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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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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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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Friction: Problem Solving01:21

Friction: Problem Solving

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Friction is an essential force that influences the motion of objects in daily life. Depending on the situation, it can be either beneficial or problematic. Consider a bus with a mass of three megagrams and its center of mass at a specific point, moving along a banked road at a constant speed. The coefficient of static friction between the tires and the road is 0.5. Find the maximum angle of the banked road at which the bus would not slip or tip.
Initially, a visual representation of the...
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Experimental Multiscale Methodology for Predicting Material Fouling Resistance
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A modified multibond model for nanoscale static friction.

Zachary B Milne1, Kathryn Hasz2, J B McClimon1

  • 1Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA, USA.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|August 1, 2022
PubMed
Summary
This summary is machine-generated.

A new modified multibond (mMB) model accurately simulates nanoscale friction, including stick-slip transitions and velocity dependence. This physically-based model enhances understanding of damping and noise effects in frictional systems.

Keywords:
Prandtl-Tomlinson modelatomic force microscopynanoscale frictionnanotribologystatistical mechanicsstick slipsurface sciencetribology

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Nanoscale friction exhibits complex behaviors like stick-slip transitions and velocity/temperature dependence.
  • Reduced-order models, such as the Prandtl-Tomlinson and multibond models, are commonly used to describe these phenomena.

Purpose of the Study:

  • To introduce a modified multibond (mMB) model incorporating a physically-based criterion for interfacial bond breaking.
  • To explicitly include damping in both the cantilever and contacting materials.
  • To enhance the simulation capabilities for nanoscale friction phenomena.

Main Methods:

  • Developed a modified multibond (mMB) model using a critical bond stretch length for bond breaking.
  • Incorporated damping in the cantilever and contacting materials.
  • Validated the model against the Fokker-Planck formalism.

Main Results:

  • The mMB model successfully captures key nanoscale friction physics, including stick-slip dynamics.
  • The model replicates the experimentally observed near-logarithmic increase in friction with scanning speed.
  • It accurately simulates the effects of damping and noise on frictional systems.

Conclusions:

  • The mMB model provides a more accurate and versatile tool for investigating nanoscale friction.
  • It offers deeper insights into the role of damping and noise in frictional behavior.
  • The model's ability to simulate multiple interaction sites expands the scope of frictional system research.