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Related Concept Videos

Frictional Force01:07

Frictional Force

11.0K
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...
11.0K
Characteristics of Dry Friction01:21

Characteristics of Dry Friction

1.1K
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

26.6K
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...
26.6K
Dry Friction01:30

Dry Friction

1.2K
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...
1.2K
Types of Friction Problems01:27

Types of Friction Problems

1.1K
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....
1.1K
Static Friction01:18

Static Friction

1.7K
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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Related Experiment Video

Updated: Apr 16, 2026

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
13:57

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

Published on: December 24, 2014

14.4K

Solid friction between soft filaments.

Andrew Ward1, Feodor Hilitski1, Walter Schwenger1

  • 1Martin Fisher School of Physics, Brandeis University, 415 South Street Waltham, Massachusetts 02454, USA.

Nature Materials
|March 3, 2015
PubMed
Summary
This summary is machine-generated.

Interfilament friction in actin bundles is surprisingly high and depends on sliding speed and overlap. Coating filaments with polymer brushes significantly reduces friction, enabling tunable composite material properties.

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The Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults
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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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The Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults
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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles

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Area of Science:

  • Biophysics
  • Materials Science
  • Soft Matter Physics

Background:

  • Macroscopic deformation of filamentous bundles involves local filament sliding and stretching.
  • The nature of sliding friction between aligned filaments with multiple contacts is not well understood.

Purpose of the Study:

  • To investigate the sliding friction between bundled F-actin filaments.
  • To explore methods for reducing interfilament friction and its impact on material properties.

Main Methods:

  • Direct measurement of sliding forces between two bundled F-actin filaments.
  • Modification of F-actin filaments by coating with polymeric brushes.
  • Observation of similar transitions in microtubules and bacterial flagella.

Main Results:

  • Frictional forces between F-actin filaments are unexpectedly large and exhibit logarithmic scaling with sliding velocity.
  • Friction depends complexly on the overlap length of the filaments.
  • Polymeric brush coating reduces friction by orders of magnitude, transitioning from solid-like friction to Stokes's drag.

Conclusions:

  • Interfilament friction can be significantly engineered by altering filament properties.
  • Controlling interfilament friction is key to tuning the properties of fibrous composite materials.
  • Findings are relevant to biological filaments like microtubules and bacterial flagella.