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Related Concept Videos

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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Dry Friction01:30

Dry Friction

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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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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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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.
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Frictional Forces on Flat Belts01:28

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Flat belts are commonly used in various industrial applications for transmitting power from one pulley to another. When a flat belt is wrapped around a set of pulleys, it experiences different tensions at the driving pulley ends due to the friction between the belt and pulley surface. When the pulley moves in a counterclockwise direction, the tension T2 on the opposite side of the pulley where the belt is moving away from is higher than the tension T1 on the side where the belt is moving...
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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Meso-scale dislocations and friction of shape-complementary soft interfaces.

Zhenping He1, Zezhou Liu2, Meng Li1,3

  • 1Department of Bioengineering, Lehigh University, Bethlehem, PA, USA.

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Sliding between patterned surfaces occurs via dislocation glide, mimicking molecular friction. This process generates out-of-plane dilation, making friction highly dependent on pressure and pattern orientation.

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Area of Science:

  • Materials Science
  • Tribology
  • Soft Matter Physics

Background:

  • Interfaces with complementary patterns accommodate misorientation and mismatch via dislocation arrays.
  • Understanding friction at patterned interfaces is crucial for designing advanced materials.

Purpose of the Study:

  • To elucidate the mechanism of relative sliding at shape-complementary interfaces.
  • To investigate the influence of dislocations on interfacial friction properties.

Main Methods:

  • Analysis of dislocation glide on the interfacial plane during sliding.
  • Examination of edge-nucleated defect motion in perfectly matched lattices.
  • Investigation of out-of-plane dilation caused by dislocations.

Main Results:

  • Sliding is primarily driven by dislocation glide, analogous to molecular friction.
  • Perfectly matched lattices exhibit sliding via edge-nucleated defects.
  • Dislocations induce significant out-of-plane dilation, leading to pressure-dependent friction.
  • Friction is also dependent on the relative orientation of the patterned surfaces.

Conclusions:

  • Shape-complementary interfaces enable engineered friction through controlled dislocation behavior.
  • These interfaces exhibit strongly enhanced, pressure- and orientation-dependent frictional properties.
  • The findings offer insights into designing materials with tunable frictional characteristics.