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Frictional Force01:07

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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

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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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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.
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Mechanisms of Heat Transfer01:14

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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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Mechanisms of Heat Transfer II01:20

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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Self-sustained frictional cooling in active matter.

Alexander P Antonov1, Marco Musacchio1, Hartmut Löwen2

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Active particles can spontaneously cool themselves internally through self-sustained frictional cooling, a novel phenomenon driven by activity and dry friction without external contact.

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Area of Science:

  • Physics
  • Robotics
  • Materials Science

Background:

  • Natural cooling processes rely on external contact with a cold reservoir.
  • Thermodynamics dictates that a system's final temperature depends on its environment.

Purpose of the Study:

  • To report a spontaneous internal cooling phenomenon in active particles.
  • To investigate self-sustained frictional cooling arising from activity and dry friction.

Main Methods:

  • Experiments and simulations were conducted on active granular robots.
  • The study analyzed the interplay between particle activity and dry (Coulomb) friction.
  • Dense particle caging was identified as a key factor for self-sustained cooling.

Main Results:

  • A novel self-sustained frictional cooling effect was demonstrated in active particles.
  • Cooling occurs internally without external contact, driven by particle motion and friction.
  • Dense, arrested clusters were observed coexisting with hotter, dilute regions.

Conclusions:

  • Self-sustained frictional cooling is a viable internal cooling mechanism for active particles.
  • This phenomenon has potential applications in regulating dynamical and structural properties of two-dimensional swarm robotics.
  • Activity and dry friction can be externally tuned to control swarm behavior.