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Related Concept Videos

Static Friction01:18

Static Friction

820
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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Characteristics of Dry Friction01:21

Characteristics of Dry Friction

642
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...
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Frictional Force01:07

Frictional Force

8.1K
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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Kinetic Friction01:26

Kinetic Friction

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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...
972
Types of Friction Problems01:27

Types of Friction Problems

589
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....
589

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

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Creasing in microscale, soft static friction.

Justin D Glover1, Xingwei Yang2, Rong Long2

  • 1Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY, 40506, USA.

Nature Communications
|April 24, 2023
PubMed
Summary
This summary is machine-generated.

A microparticle moving on a soft surface forms a crease due to compressive stress. Interfacial strength, not just adhesion, is key to crease formation and Schallamach wave-like motion.

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Area of Science:

  • Soft matter physics
  • Tribology
  • Adhesion science

Background:

  • Understanding microparticle motion on soft, adhesive surfaces is crucial for various applications.
  • Previous studies have focused on normal adhesion, but the role of interfacial strength in lateral motion is less understood.

Purpose of the Study:

  • To investigate the mechanism of lateral microparticle motion initiation on soft, adhesive surfaces.
  • To determine the factors influencing crease formation and propagation during motion.

Main Methods:

  • Combined experimental techniques: colloidal probe, lateral force microscopy, and confocal microscopy.
  • Computational modeling: finite element analysis to simulate stress and adhesion effects.

Main Results:

  • Observed formation of self-contacting creases at the microparticle's leading edge due to compressive stress.
  • Creases form across a range of normal adhesion levels, highlighting the importance of other factors.
  • Simulations revealed interfacial strength as the dominant factor in crease nucleation.
  • Crease propagation occurs in a Schallamach wave-like manner, facilitated by slip at the self-contacting interface.

Conclusions:

  • Interfacial strength is critical for initiating lateral motion and crease formation on soft adhesive surfaces.
  • The observed Schallamach wave-like motion is enabled by slip within the self-contacting crease.
  • This study provides new insights into the mechanics of friction and adhesion at the microscale.