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Related Concept Videos

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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Rolling Without Slipping01:09

Rolling Without Slipping

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People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is...
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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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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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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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Rolling With Slipping01:14

Rolling With Slipping

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Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can...
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Related Experiment Video

Updated: Aug 29, 2025

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

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Friction Induces Anisotropic Propulsion in Sliding Magnetic Microtriangles.

Gaspard Junot1, Sergi G Leyva1,2, Christoph Pauer3

  • 1Departament de Física de la Matèria Condensada, Universitat de Barcelona, 08028 Barcelona, Spain.

Nano Letters
|September 5, 2022
PubMed
Summary
This summary is machine-generated.

Researchers used magnetic microtriangles to steer microscopic particle motion in viscous fluids. Exploiting asymmetric shapes, they achieved controlled directional transport, a breakthrough for micro-robotics and microfluidics.

Keywords:
Active ColloidsMagnetismMicromotorsShape-anisotropySoft-lithography

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Area of Science:

  • Physics
  • Materials Science
  • Microfluidics

Background:

  • Microscopic particles exhibit unique transport behaviors in viscous fluids compared to macroscopic objects.
  • Steering micro-particle motion using friction asymmetry is a significant challenge in micro-robotics and microfluidics.

Purpose of the Study:

  • To investigate complex transport modes of lithographically shaped magnetic microtriangles driven by a precessing magnetic field.
  • To exploit the asymmetric shape of microtriangles for controlled directional transport in fluid media.

Main Methods:

  • Fabrication of magnetic microtriangles using soft-lithography.
  • Driving microtriangle motion with a precessing magnetic field.
  • Development of a minimal numerical model to explain observed transport phenomena.

Main Results:

  • Observed complex transport modes, including a surfing-like drift near the bottom plane.
  • Achieved controllable transversal drift by exploiting the microtriangle's asymmetric shape.
  • Demonstrated the ability to transport microtriangles in any desired direction on the plane.

Conclusions:

  • Friction-induced anisotropic sliding enables precise control over microparticle motion.
  • The developed method offers a flexible approach for guiding field-responsive microstructures in fluids.
  • Potential applications include micro-robotics, targeted drug delivery, and lab-on-a-chip devices.