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Related Concept Videos

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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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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Rolling Resistance01:21

Rolling Resistance

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When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down due to...
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Rolling With Slipping01:14

Rolling With Slipping

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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.
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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.
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Related Experiment Video

Updated: Nov 4, 2025

The Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults
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Resonance in Atomic-Scale Sliding Friction.

Zaoqi Duan1, Zhiyong Wei1, Shuyu Huang1

  • 1Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189, China.

Nano Letters
|May 21, 2021
PubMed
Summary
This summary is machine-generated.

Friction converts motion to heat by exciting phonons not just at the fundamental washboard frequency but also its harmonics. This discovery reveals new energy dissipation pathways and offers insights into controlling friction.

Keywords:
energy dissipationforcephononphononic frictionresonance

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Area of Science:

  • Tribology
  • Nanomechanics
  • Solid State Physics

Background:

  • Friction is a primary energy dissipation mechanism, converting mechanical work into heat.
  • The precise atomistic origins of friction-induced heating, particularly phonon excitation, are not fully understood.
  • Previous theories focused on the fundamental washboard frequency for phonon generation.

Purpose of the Study:

  • To investigate the atomistic mechanisms of friction-induced heat generation.
  • To explore the role of nonlinear tip-substrate interactions in phonon excitation.
  • To understand how these phonons influence friction force at various sliding velocities.

Main Methods:

  • Atomic force microscopy (AFM) measurements were performed.
  • Atomistic modeling and simulations were employed.
  • Combined experimental and computational approaches were used to analyze friction dynamics.

Main Results:

  • Nonlinear tip-substrate interactions generate excess phonons at the washboard frequency and its harmonics.
  • These nonequilibrium phonons can induce resonant vibrations of the sliding tip.
  • Multiple peaks in friction force were observed as sliding velocity increased, correlating with resonant vibrations.

Conclusions:

  • Friction dissipation involves energy transfer to phonons at multiple frequencies, not just the fundamental.
  • Tip vibration, driven by harmonic phonons, represents a significant, previously unrecognized energy dissipation channel.
  • Controlling friction can be achieved by engineering the resonant frequencies within the tip-substrate system.