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Related Concept Videos

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 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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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 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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Characteristics of Dry Friction01:21

Characteristics of Dry Friction

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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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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...
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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Static friction between rigid fractal surfaces.

Fernando Alonso-Marroquin1, Pengyu Huang1, Dorian A H Hanaor1

  • 1School of Civil Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 15, 2015
PubMed
Summary
This summary is machine-generated.

Investigating fractal surfaces reveals macroscopic friction depends on atomic friction and surface slope. A novel signature function accurately describes surface morphology for predicting friction, outperforming traditional slope analysis.

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Area of Science:

  • Tribology
  • Materials Science
  • Surface Physics

Background:

  • Surface topography and atomic-scale friction significantly influence macroscopic friction.
  • Fractal surface structures present complex challenges for traditional friction modeling.

Purpose of the Study:

  • To investigate the combined effects of surface topography and atomic friction on macroscopic friction.
  • To develop a new theoretical framework and simulation method for predicting friction on fractal surfaces.

Main Methods:

  • Spheropolygon-based simulations were employed to model rigid blocks with fractal surface structures.
  • Contact slope analysis and a novel signature function were utilized to determine surface profile interactions.
  • Mathematical derivation established the relationship between atomic friction, surface slope, and macroscopic friction.

Main Results:

  • The angle of macroscopic friction was found to be the sum of atomic friction angle and contact surface slope angle.
  • Simulations validated the theoretical model using fractal Koch and Weierstrass-Mandelbrot surfaces.
  • The signature function proved effective in describing frictional properties of complex fractal surfaces.

Conclusions:

  • The study provides a validated theoretical and simulation approach for understanding friction on fractal surfaces.
  • Interpreting macroscopic friction requires surface morphology descriptors derived from the signature function, not just surface slopes.
  • This work advances the predictive capabilities for frictional behavior in systems with complex surface topographies.