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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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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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Second Law: Motion under Same Force01:10

Second Law: Motion under Same Force

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Newton's laws can be applied to bodies at rest and bodies in motion. Newton's first law is applied to bodies in equilibrium, whereas the second law applies to accelerating bodies. To study accelerating bodies, first, the directions and magnitudes of acceleration and the applied forces are determined. Then, the free-body diagram is constructed, and Newton's second law is applied, considering the components of the forces in the x and y directions.
Let's imagine a person is...
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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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Non-conservative Forces01:17

Non-conservative Forces

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Non-conservative forces are dissipative forces such as friction or air resistance. These forces take energy away from a system as it progresses. Unlike conservative forces, non-conservative forces do not have potential energy associated with them. This is because the energy is lost to the system and cannot be turned into useful work later.
Also unlike their conservative counterparts, they are path-dependent; where the object starts and stops does matter. For example, a grinding wheel applies a...
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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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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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Friction forces on atoms after acceleration.

Francesco Intravaia1, Vanik E Mkrtchian, Stefan Yoshi Buhmann

  • 1Max-Born-Institute, Max-Born-Straße 2a, 12489 Berlin, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 13, 2015
PubMed
Summary
This summary is machine-generated.

Quantum friction between atoms and surfaces depends on the atom's acceleration. Calculations reveal that the frictional force scales with velocity to the power of three or four, depending on the method used.

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Area of Science:

  • Quantum Field Theory
  • Atomic Physics
  • Surface Science

Background:

  • Atom-surface interactions are crucial in nanoscale phenomena.
  • Quantum friction arises from vacuum fluctuations near surfaces.
  • Previous models of quantum friction have varying predictions.

Purpose of the Study:

  • To re-examine atom-surface quantum friction calculations.
  • To investigate the influence of atomic acceleration on friction.
  • To clarify the velocity dependence of quantum frictional forces.

Main Methods:

  • Utilizing the quantum field theory formulation by Barton (2010).
  • Analyzing power dissipation into field excitations.
  • Calculating the average radiation force on the atom.

Main Results:

  • Frictional force and power dissipation depend on the atom's boosting method.
  • A cancellation between one- and two-photon processes leads to v^4 dependence.
  • An alternative calculation confirms a v^3 scaling for the average radiation force.

Conclusions:

  • The precise calculation of quantum friction requires careful consideration of atomic dynamics.
  • The velocity dependence of quantum friction is sensitive to the theoretical approach.
  • This study refines understanding of quantum friction in atom-surface systems.