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Related Concept Videos

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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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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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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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....
574
Characteristics of Dry Friction01:21

Characteristics of Dry Friction

631
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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Frost Action on Concrete01:27

Frost Action on Concrete

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Concrete structures in cold climates, such as those along roadsides, can retain moisture. This moisture makes them susceptible to frost-related damage when temperatures fall below freezing. Adding moisture worsens the damage during temperature fluctuations, leading to repeated freezing and thawing. De-icing salts, spread over these structures to melt ice, add to the freeze-thaw cycle, and draw even more moisture into the concrete.
This freeze-thaw cycle primarily causes surface scaling, where...
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Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications
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Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications

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Ice breakloose friction.

B N J Persson1,2, E C Tyrode3

  • 1Peter Grünberg Institute (PGI-1), Forschungszentrum Jülich, 52425 Jülich, Germany.

The Journal of Chemical Physics
|June 15, 2023
PubMed
Summary
This summary is machine-generated.

The static friction force on ice sliding on rough surfaces originates from interfacial slip, determined by stored elastic energy. This energy depends on surface roughness and transitions to bond breaking at lower temperatures.

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Area of Science:

  • Physics
  • Materials Science
  • Tribology

Background:

  • Understanding static friction is crucial for predicting ice block movement.
  • Randomly rough hard substrates present complex interfacial interactions.
  • Previous models often simplify surface topography and energy considerations.

Purpose of the Study:

  • To investigate the origin of breakloose (static) friction force for an ice block on a rough substrate.
  • To determine the relationship between interfacial energy and friction.
  • To explore the influence of temperature on friction mechanisms.

Main Methods:

  • Theoretical modeling of friction force based on interfacial energy.
  • Assumption of complete contact and no initial elastic deformation.
  • Analysis of surface roughness power spectrum and its effect on friction.
  • Comparison of theoretical predictions with experimental observations.

Main Results:

  • Breakloose force is linked to elastic energy per unit area (Uel/A0) stored at the interface for small amplitude roughness.
  • Friction force is dependent on the substrate's surface roughness power spectrum.
  • Experimental observations align well with the developed theoretical model.
  • A temperature-dependent transition from interfacial sliding (mode II) to normal bond breaking (mode I) was identified.

Conclusions:

  • Interfacial slip, governed by stored elastic energy, is a primary source of static friction for ice on rough surfaces.
  • Surface roughness characteristics significantly influence the breakloose force.
  • Temperature plays a critical role, dictating a shift in the dominant friction mechanism from sliding to bond rupture.