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Related Concept Videos

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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Plasticizers01:31

Plasticizers

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Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
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Rolling With Slipping01:14

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Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
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Logarithmic Differentiation01:28

Logarithmic Differentiation

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When a car’s weight and driving forces act on a tire, they impose an external load on the rubber material. This load is resisted internally by forces distributed throughout the tire structure, which are defined as stress. The resulting deformation of the rubber due to this stress is quantified as strain. The relationship between stress and strain governs how the tire deforms under load and is central to understanding its mechanical response during operation.Rubber exhibits a nonlinear...
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Rolling Resistance01:21

Rolling Resistance

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When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
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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.
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Experimental Research Examining How People Can Cope with Uncertainty Through Soft Haptic Sensations
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Why pens have rubbery grips.

Brygida Dzidek1, Séréna Bochereau2, Simon A Johnson3

  • 1School of Engineering, University of Birmingham, Birmingham B15 2TT, United Kingdom.

Proceedings of the National Academy of Sciences of the United States of America
|October 5, 2017
PubMed
Summary
This summary is machine-generated.

Human finger contact with smooth surfaces is slow, evolving over 20 seconds due to moisture-driven keratin coalescence. This challenges using gross contact area as a reliable measure in grip studies.

Keywords:
biotribologyfinger frictionfingerprintstrue contact area kinetics

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Area of Science:

  • Biophysics
  • Materials Science
  • Human-Computer Interaction

Background:

  • Human finger contact with smooth, hard surfaces is crucial for grip and object manipulation.
  • The dynamics of fingerpad contact formation are not fully understood, particularly concerning the role of skin properties.

Purpose of the Study:

  • To investigate the time-dependent evolution of human finger contact with a smooth, hard surface.
  • To elucidate the underlying mechanisms governing contact formation and its relationship to skin hydration and material properties.

Main Methods:

  • High-resolution imaging was employed to observe the contact evolution between human finger pads and a glass surface.
  • The study analyzed the kinetics of contact area formation and correlated it with skin moisture content and applied normal force.

Main Results:

  • Contact formation followed a first-order kinetics relationship, indicating a time-dependent process.
  • A two-stage coalescence of microscopic junctions, driven by sweat gland moisture secretion, was identified as the primary mechanism.
  • Contact saturation was typically achieved within 20 seconds, irrespective of initial finger moisture or applied force.

Conclusions:

  • The gross contact area is an inadequate metric for assessing actual contact mechanics with smooth, impermeable surfaces.
  • Contact formation is significantly influenced by skin hydration, which softens the stratum corneum.
  • Instantaneous contact occurs with soft surfaces, explaining the use of elastomers in grip applications.