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Related Concept Videos

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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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

846
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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Dry Friction01:30

Dry Friction

754
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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Updated: Dec 9, 2025

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Friction of a soft hydrogel on rough solid substrates.

Taiki Tominaga1, Takayuki Kurokawa1, Hidemitsu Furukawa1

  • 1Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan. gong@sci.hokudai.ac.jp.

Soft Matter
|September 10, 2020
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Summary
This summary is machine-generated.

Friction between soft hydrogels and rough surfaces depends on velocity. At low speeds, roughness increases friction, but at higher speeds, it decreases, influenced by gel properties and surface energy.

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Area of Science:

  • Materials Science
  • Tribology
  • Soft Matter Physics

Background:

  • Understanding friction is crucial for designing soft materials.
  • Hydrogel friction is complex and influenced by surface properties and environmental conditions.

Purpose of the Study:

  • To investigate the sliding friction of soft hydrogels on rough substrates in an aqueous environment.
  • To elucidate the role of substrate roughness, surface energy, and velocity on hydrogel friction.

Main Methods:

  • Utilized polyvinyl alcohol (PVA) hydrogels with varying elastic moduli.
  • Employed glass substrates with controlled surface roughness and contact angles.
  • Measured friction using a strain-controlled parallel-plate rheometer.

Main Results:

  • Friction increased slightly with roughness at low velocities.
  • Friction significantly decreased above a critical velocity (>1 μm roughness).
  • Frictional stress depended on surface energy below the critical velocity but not above it.

Conclusions:

  • Hydrogel friction on rough surfaces exhibits velocity-dependent behavior.
  • Two characteristic velocities, vf and vdrainage, govern friction dynamics.
  • vf relates to gel diffusion, while vdrainage depends on roughness and pressure.