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Related Concept Videos

Types of Forces01:09

Types of Forces

In most situations, forces can be grouped into two categories: contact forces and field forces.  Contact forces occur as a result of direct physical contact between objects. Field forces, however, act without the necessity of physical contact between objects. They depend on the presence of a "field" in the region of space surrounding the body under consideration. You can think of a field as a property of space that is detectable by the forces it exerts. Scientists think there are only four...
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Non-conservative Forces

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...
Force Classification01:22

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Forces play a crucial role in the study of physics and engineering. They are essential in describing the motion, behavior, and equilibrium of objects in the physical world. Forces can be classified based on their origin, type, and direction of action.
Contact and non-contact forces are two of the most widely used categories of forces. As the name suggests, contact forces require physical contact between two objects to act upon each other. Examples of contact forces include frictional,...
Force01:06

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Classical Mechanics01:12

Classical Mechanics

Classical mechanics provides a mathematical description of the motion of bodies under the influence of forces. A key principle within this field is the work-energy theorem, which establishes a bridge between the net work done on an object and its kinetic energy.The work-energy theorem states that the net work done on a particle by all the forces acting on it equals the change in its kinetic energy.In simple terms, the work-energy theorem is a method to analyze the effects of forces on an...
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Conservative Vector Fields

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Label-free Isolation and Enrichment of Cells Through Contactless Dielectrophoresis
10:38

Label-free Isolation and Enrichment of Cells Through Contactless Dielectrophoresis

Published on: September 3, 2013

Drag forces in classical fields.

Vincent Démery1, David S Dean

  • 1Université de Toulouse, UPS, Laboratoire de Physique Théorique (IRSAMC), CNRS UMR5152, F-31062 Toulouse, France.

Physical Review Letters
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

Defects moving through classical fields experience a drag force dependent on field dynamics and inclusion coupling. This model explains drag on proteins in lipid membranes and magnetic fields in ferromagnets.

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Area of Science:

  • Physics
  • Physical Chemistry
  • Materials Science

Background:

  • Inclusions moving through fields can experience resistance.
  • Understanding this resistance is crucial for predicting behavior in complex systems like membranes.

Purpose of the Study:

  • To develop a theoretical framework for calculating drag forces on inclusions in classical fields.
  • To apply this framework to predict drag on proteins in lipid membranes and magnetic defects in ferromagnets.

Main Methods:

  • Derivation of a drag force formula based on field dynamics and inclusion coupling.
  • Validation using Monte Carlo simulations of a magnetic field in an Ising ferromagnet.

Main Results:

  • A drag force is predicted for inclusions moving at constant velocity through classical fields.
  • The force depends on field dynamics and the inclusion-field coupling strength.
  • The model accurately predicts simulation results for magnetic field inclusions.

Conclusions:

  • The derived drag force model provides a generalizable approach for diverse physical systems.
  • This work offers insights into the movement of inclusions within lipid membranes and magnetic materials.