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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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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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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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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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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 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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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Dynamically induced friction reduction in micro-structured interfaces.

N Menga1,2, F Bottiglione3, G Carbone3,4,5

  • 1Department of Mechanics, Mathematics and Management, Politecnico of Bari, V.le Japigia, 182, 70126, Bari, Italy. nicola.menga@poliba.it.

Scientific Reports
|April 15, 2021
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Summary
This summary is machine-generated.

This study shows that elastic supports can reduce friction between sliding surfaces. Microscopic vibrations of these supports lower the overall friction force, allowing for tunable friction control.

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Area of Science:

  • Solid Mechanics
  • Tribology
  • Materials Science

Background:

  • Understanding friction is crucial for designing mechanical systems.
  • Existing friction models often simplify the complex interactions at interfaces.
  • Investigating novel methods to control friction is an active area of research.

Purpose of the Study:

  • To explore the dynamic behavior of elastic supports between sliding surfaces.
  • To analyze how these supports influence frictional interactions.
  • To determine if elastic supports can reduce friction compared to direct sliding.

Main Methods:

  • Modeling a regular array of in-plane elastic supports.
  • Each support consists of a mass with radial and tangential elastic elements.
  • Analyzing frictional interactions at the interface between supports and a sliding body.

Main Results:

  • Different dynamic regimes and frictional behaviors were observed based on elastic properties.
  • Transverse microscopic vibrations of supports led to reduced friction.
  • Support orientation was found to be critical in controlling interfacial friction.

Conclusions:

  • Elastic supports can effectively reduce friction through induced vibrations.
  • The static orientation of supports offers a design parameter for friction control.
  • This work provides insights into designing surfaces with tunable frictional properties.