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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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Types of Friction Problems01:27

Types of Friction Problems

978
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....
978
Friction: Problem Solving01:21

Friction: Problem Solving

505
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...
505
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...
9.9K
Dry Friction01:30

Dry Friction

975
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...
975
Static Friction01:18

Static Friction

1.4K
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...
1.4K

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相关实验视频

Updated: Jan 29, 2026

Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
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Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars

Published on: February 11, 2020

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在颗粒状材料中以摩擦控制的回流剂老化和流化.

Ye Yuan1, Walter Kob2, Hajime Tanaka1,3

  • 1Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo 153-8904, Japan.

Proceedings of the National Academy of Sciences of the United States of America
|January 27, 2026
PubMed
概括

摩擦在颗粒状材料的紧缩中起着双重作用,影响老化和流体化. 这项研究揭示了摩擦如何控制颗粒系统中密集的动态.

关键词:
压缩和衰老的时间.摩擦动力学的摩擦动力学颗粒状材料是颗粒状的材料.阻塞和流化方式

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科学领域:

  • 物理 物理学 物理
  • 材料科学 材料科学 材料科学
  • 非线性动力学是一种非线性动力学.

背景情况:

  • 颗粒状材料在机械应力下表现出老化和密集.
  • 这种行为是由摩擦接触和能量消散驱动的,与热眼镜不同.
  • 了解这些不平衡动态对于自然和工业过程至关重要.

研究的目的:

  • 为了研究摩擦在控制颗粒紧缩动态中的作用.
  • 根据应变幅度和摩擦构建一个动态状态图,映射基于应变幅度和摩擦的压缩行为.
  • 揭示了基本的不平衡机制,控制了大热系统中压缩,质和老化.

主要方法:

  • 使用离散元素模拟来建模颗粒包装.
  • 应用半静态循环剪切来扰乱系统.
  • 分析动态状态图,以识别不同的状态和过渡.

主要成果:

  • 确定了一种依赖摩擦的交叉菌株,将老化和流化疗法分开.
  • 摩擦表现出非单调的行为,最初抑制然后促进流化.
  • 观察到从间歇性,雪崩般的重排到连续的,扩散运动的过渡.

结论:

  • 摩擦在颗粒老化过程中起着双重作用,既可以作为稳定剂,又可以作为流化剂.
  • 这些发现揭示了摩擦如何控制异常稳定性和异热物质中的流动的一般原则.
  • 这项研究将微观接触力学与土壤和地震断层等系统中的宏观动力学联系起来.