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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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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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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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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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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....
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Related Experiment Video

Updated: Dec 2, 2025

Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer
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Laser Microtextured Surfaces for Friction Reduction: Does the Pattern Matter?

Carmine Putignano1,2, Giuliano Parente1, Francisco Josè Profito3

  • 1Department of Mechanics, Mathematics and Management, Politecnico di Bari, 70126 Bari, Italy.

Materials (Basel, Switzerland)
|November 4, 2020
PubMed
Summary
This summary is machine-generated.

Surface textures significantly impact friction in lubrication. Dimple patterns trap debris at low speeds and reduce shear stress via cavitation at high speeds, optimizing lubricant performance.

Keywords:
friction reductionlaser micro-texturinglubrication

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Area of Science:

  • Tribology and Surface Engineering
  • Fluid Dynamics and Lubrication

Background:

  • Understanding surface texture effects is crucial for optimizing lubrication performance.
  • Mixed and hydrodynamic lubrication regimes present unique challenges for friction reduction.

Purpose of the Study:

  • To investigate the frictional performance of various surface textures (axisymmetric and directional) under different lubrication regimes.
  • To elucidate the role of geometrical pattern void ratio in friction modulation.

Main Methods:

  • Experimental testing of frictional performance with diverse surface textures.
  • Numerical simulations to corroborate experimental findings.
  • Analysis of lubrication regimes including mixed and hydrodynamic conditions.

Main Results:

  • Geometrical pattern void ratio is identified as the primary parameter influencing friction.
  • At low speeds, a high void ratio traps debris; at high speeds, it induces micro-cavitation and reduces shear stress.
  • Directional textures create hydrodynamic wedges, leading to flow-direction-dependent friction.

Conclusions:

  • Surface texture design, particularly void ratio and directionality, offers effective control over friction in lubrication.
  • Engineered textures can mitigate wear by debris trapping and reduce energy loss through controlled cavitation.