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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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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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Hydrostatic Pressure Force on a Curved Surface01:04

Hydrostatic Pressure Force on a Curved Surface

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Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
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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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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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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.
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Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall
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A Consistent Framework for Coupling Basal Friction With Subglacial Hydrology on Hard-Bedded Glaciers.

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This study introduces a unified model for glacier basal friction and drainage, improving predictions of glacier sliding speed. The new model accurately explains real-world glacier data by linking cavity evolution to both friction and water flow.

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Area of Science:

  • Glaciology
  • Geophysics
  • Environmental Science

Background:

  • Subglacial drainage and basal friction in glaciers are controlled by basal cavities.
  • Existing hydro-mechanical models treat cavity-driven friction and hydraulic transmissivity separately, leading to inconsistencies.
  • A unified approach is needed to accurately model glacier basal processes.

Purpose of the Study:

  • To develop a novel coupled hydro-mechanical model for glacier basal processes.
  • To ensure a consistent description of cavity evolution governing both friction and drainage.
  • To validate the model against observational data of glacier sliding speed.

Main Methods:

  • Developed a common cavity-evolution description for transient friction and hydraulic transmissivity.
  • Coupled hydro-mechanical model incorporating unified cavity dynamics.
  • Validation using a unique observational record of glacier sliding speed from the French Alps.

Main Results:

  • The new coupling approach resolves inconsistencies found in previous models.
  • The model successfully explains observed glacier sliding speeds.
  • Sliding speed is directly related to basal shear stress and water discharge on multi-day to multi-decadal timescales.

Conclusions:

  • A unified cavity-evolution model provides a more physically consistent representation of glacier basal processes.
  • The model advances our understanding of glacier sliding dynamics and subglacial hydrology.
  • Water pressure is a dependent variable adjusting to maintain necessary cavitation ratios.