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Related Concept Videos

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.
However, if two systems are in contact and are stationary relative to one...
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Characteristics of Dry Friction01:21

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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

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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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Static Friction01:18

Static Friction

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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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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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Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer
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Oscillating friction on shape-tunable wrinkles.

Kosuke Suzuki1, Yuji Hirai, Takuya Ohzono

  • 1Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) , 1-1-1 Higashi, Tsukuba 305-8565, Japan.

ACS Applied Materials & Interfaces
|April 15, 2014
PubMed
Summary
This summary is machine-generated.

Friction on wrinkled surfaces shows oscillations linked to material deformation. Higher loads or flatter wrinkles reduce oscillation amplitude, revealing topography

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Area of Science:

  • Tribology
  • Soft Matter Physics
  • Surface Science

Background:

  • Friction in soft materials is closely tied to deformation.
  • Surface topography can influence this deformation and friction.
  • Understanding these relationships is key for designing advanced materials.

Purpose of the Study:

  • Investigate wearless sliding friction between a rigid indenter and a deformable wrinkled surface.
  • Analyze the impact of wrinkle aspect ratio, normal load, and sliding direction on friction.
  • Elucidate the correlation between frictional oscillations and wrinkle deformation.

Main Methods:

  • Utilized a rigid hemispherical indenter comparable in size to wrinkle wavelengths.
  • Varied wrinkle aspect ratio, applied normal load, and wrinkle alignment relative to sliding direction.
  • Employed optical imaging and friction profiling to observe and analyze frictional behavior.

Main Results:

  • Observed frictional oscillations during sliding perpendicular to wrinkle alignment.
  • Demonstrated that friction force increases as the indenter plows wrinkle crests.
  • Found that high normal loads or low wrinkle aspect ratios decrease oscillation amplitude by maintaining contact.

Conclusions:

  • Frictional oscillations are directly linked to the elastic deformation of wrinkled surfaces.
  • Surface topography, specifically wrinkle geometry and alignment, significantly modulates friction.
  • The findings provide insights into controlling friction through surface texturing in soft materials.