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相关概念视频

Rolling With Slipping01:14

Rolling With Slipping

4.8K
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...
4.8K
Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

15.5K
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...
15.5K
Characteristics of Dry Friction01:21

Characteristics of Dry Friction

448
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...
448
Rolling Without Slipping01:09

Rolling Without Slipping

3.5K
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...
3.5K
Equation of Motion: General Plane motion - Problem Solving01:16

Equation of Motion: General Plane motion - Problem Solving

166
Consider a lawn roller with a mass of 100 kg, a radius of 0.2 meters, and a radius of gyration of 0.15 meters. A force of 200 N is applied to this roller, angled at 60 degrees from the horizontal plane. What will be the angular acceleration of the lawn roller?
The friction between the roller and the ground is characterized by two coefficients. The static friction coefficient is 0.15, while the kinetic friction coefficient is 0.1. These values are crucial in understanding the interaction between...
166
Rolling Resistance01:21

Rolling Resistance

248
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...
248

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相关实验视频

Updated: May 24, 2025

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
11:51

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

Published on: February 22, 2018

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单个粒子之间的滑动和滚动接触的特征.

Simon Scherrer1, Shivaprakash N Ramakrishna1, Vincent Niggel1

  • 1Department of Materials, ETH Zürich, Zürich 8093, Switzerland.

Proceedings of the National Academy of Sciences of the United States of America
|March 6, 2025
PubMed
概括
此摘要是机器生成的。

悬浮中的颗粒接触是它们流动性质的关键. 这项研究揭示了粗性和粘附性如何微观地影响摩擦和粒子运动,为控制材料行为提供了新的方法.

关键词:
密度悬浮的密度悬浮是指高密度悬浮.侧向力显微镜 侧向力显微镜滚动摩擦 滚动摩擦 滚动摩擦剪切厚度增加 剪切厚度增加滑动摩擦摩擦 滑动摩擦

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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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Studying Cell Rolling Trajectories on Asymmetric Receptor Patterns
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Studying Cell Rolling Trajectories on Asymmetric Receptor Patterns

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相关实验视频

Last Updated: May 24, 2025

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
11:51

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

Published on: February 22, 2018

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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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Studying Cell Rolling Trajectories on Asymmetric Receptor Patterns
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科学领域:

  • 类风病学 类风病学 类风病学
  • 体科学是一种体科学.
  • 部落学 (tribology) 是一个学科.

背景情况:

  • 颗粒接触控制了密集,剪切悬浮的风学.
  • 微观了解粗性和粘附性如何影响接触器中的力传递是有限的.
  • 之前的研究缺乏直接实验测量粒子接触层上的摩擦系数.

研究的目的:

  • 实验性地研究粒子接触时的力传递和相对运动的微观机制.
  • 同时测量正常和触力,定制表面和微粒之间的滑动和滚动摩擦.
  • 阐明表面粗度和粘附在决定粒子接触动态和质性质方面的作用.

主要方法:

  • 开发和应用一种创新的合式探针原子力显微镜技术.
  • 在粒子-表面相互作用期间同时测量正常和触力.
  • 追踪相对滑动和滚动运动以确定摩擦系数.

主要成果:

  • 当引力足够时,粒子自发滚动,减少能量消散,延长接触时间.
  • 当滚动受到阻碍时,粗和粘合面的摩擦显著增加.
  • 用聚合物刷的光滑颗粒表现出滑良好的接触,最大限度地减少摩擦.
  • 表面粗性促进负载依赖的度相互锁定,诱导离轴粒子旋转和滚动.
  • 光滑的粘合面导致沿主要运动轴滚动.

结论:

  • 可以直接测量滑动和滚动摩擦系数.
  • 了解表面特性如何影响粒子接触力学和质学的理解是先进的.
  • 结果为数值模拟提供了关键数据,并为不连续剪切加厚提供了见解.
  • 证明了通过工程表面接触量身定制悬浮体质学的潜力.