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Related Concept Videos

Frictional Force01:07

Frictional Force

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...
Static Friction01:18

Static Friction

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...
Rolling Resistance01:21

Rolling Resistance

When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down due to...
Dry Friction01:30

Dry Friction

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...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
Friction: Problem Solving01:21

Friction: Problem Solving

Friction is an essential force that influences the motion of objects in daily life. Depending on the situation, it can be either beneficial or problematic. Consider a bus with a mass of three megagrams and its center of mass at a specific point, moving along a banked road at a constant speed. The coefficient of static friction between the tires and the road is 0.5. Find the maximum angle of the banked road at which the bus would not slip or tip.
Initially, a visual representation of the...

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Related Experiment Video

Updated: May 17, 2026

Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators
11:44

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Electric-field-induced friction reduction and control.

Carlos Drummond1

  • 1CNRS, Centre de Recherche Paul Pascal (CRPP), UPR 8641, F-33600 Pessac, France. drummond@crpp-bordeaux.cnrs.fr

Physical Review Letters
|October 30, 2012
PubMed
Summary

Control surface friction by adjusting polyelectrolyte molecular structure with electric fields. This method precisely regulates polymer brush interpenetration and chain stretching during sliding, offering active friction management.

Area of Science:

  • Surface science and tribology
  • Polymer physics
  • Soft matter physics

Background:

  • Friction is a ubiquitous phenomenon hindering motion between surfaces.
  • Understanding and controlling friction at the molecular level is crucial for various applications.
  • Existing methods for friction control often lack precision or active tunability.

Purpose of the Study:

  • To demonstrate precise, active control over macroscopic friction.
  • To investigate the role of polyelectrolyte molecular conformation in friction.
  • To establish a method for friction modulation using external electric fields.

Main Methods:

  • Utilizing an alternating electric field to modify polyelectrolyte conformation.
  • Analyzing the degree of polymer brush interpenetration during sliding.

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  • Correlating electric field intensity with friction force and chain dynamics.

    • Main Results:

    • Achieved active control of global friction by tuning local molecular conformation.
    • Demonstrated that electric field intensity dictates polymer brush interpenetration.
    • Identified chain stretching during sliding as the origin of friction, regulated by the applied field.

    Conclusions:

    • Precise friction control is achievable by actively manipulating polyelectrolyte molecular structure.
    • Alternating electric fields offer a powerful tool for dynamic friction management.
    • The relaxation dynamics of polyelectrolytes govern the speed of friction modulation.