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Related Concept Videos

Kinetic Friction01:26

Kinetic Friction

1.4K
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...
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Types of Friction Problems01:27

Types of Friction Problems

978
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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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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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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Dry Friction01:30

Dry Friction

975
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...
975
Static Friction01:18

Static Friction

1.4K
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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Related Experiment Video

Updated: Jan 29, 2026

Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
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Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars

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Friction-controlled reentrant aging and fluidization in granular materials.

Ye Yuan1, Walter Kob2, Hajime Tanaka1,3

  • 1Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo 153-8904, Japan.

Proceedings of the National Academy of Sciences of the United States of America
|January 27, 2026
PubMed
Summary
This summary is machine-generated.

Friction plays a dual role in granular material compaction, influencing aging and fluidization. This study reveals how friction controls the dynamics of densification in granular systems.

Keywords:
compaction and agingfrictional dynamicsgranular materialsjamming and fluidization

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Area of Science:

  • Physics
  • Materials Science
  • Nonlinear Dynamics

Background:

  • Granular materials exhibit aging and densification under mechanical stress.
  • This behavior is driven by frictional contacts and energy dissipation, differing from thermal glasses.
  • Understanding these nonequilibrium dynamics is crucial for natural and industrial processes.

Purpose of the Study:

  • To investigate the role of friction in controlling granular compaction dynamics.
  • To construct a dynamic state diagram mapping compaction behavior based on strain amplitude and friction.
  • To uncover the fundamental nonequilibrium mechanisms governing compaction, rheology, and aging in athermal disordered systems.

Main Methods:

  • Utilizing discrete element simulations to model granular packings.
  • Applying quasistatic cyclic shear to perturb the systems.
  • Analyzing the dynamic state diagram to identify different regimes and transitions.

Main Results:

  • A friction-dependent crossover strain was identified, separating aging and fluidized regimes.
  • Friction exhibits nonmonotonic behavior, initially suppressing then promoting fluidization.
  • A transition from intermittent, avalanche-like rearrangements to continuous, diffusive motion was observed.

Conclusions:

  • Friction plays a dual role in granular aging, acting as both a stabilizing and fluidizing agent.
  • The findings reveal general principles for how friction governs metastability and flow in athermal matter.
  • This research links microscopic contact mechanics to macroscopic dynamics in systems like soils and seismic faults.