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Related Concept Videos

Frictional Forces on Screws01:17

Frictional Forces on Screws

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Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
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Flat belts are commonly used in various industrial applications for transmitting power from one pulley to another. When a flat belt is wrapped around a set of pulleys, it experiences different tensions at the driving pulley ends due to the friction between the belt and pulley surface. When the pulley moves in a counterclockwise direction, the tension T2 on the opposite side of the pulley where the belt is moving away from is higher than the tension T1 on the side where the belt is moving...
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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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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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Fluid Movement Between Compartments01:18

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The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...
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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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Parametric Optimization Design Method for Friction Plates of Hydro-Viscous Clutches
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Frictionless segmented mechanics for controlled space closure.

Ildeu Andrade1

  • 1Pontifícia Universidade Católica, Minas, Brazil.

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Orthodontic extraction space closure requires precise control for optimal occlusion. A novel segmented mechanics system offers predictable force application and treatment outcomes in orthodontics.

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Area of Science:

  • Orthodontics
  • Dentofacial Orthopedics

Background:

  • Achieving harmonious dentition with the craniofacial complex often necessitates orthodontic extraction spaces.
  • The final occlusal position is fundamentally determined by the orthodontist's control during extraction space closure.

Observation:

  • Treatment objectives vary, requiring either stable posterior teeth with anterior space closure or vice versa.
  • Intentional alternatives in extraction site management are crucial for diverse orthodontic goals.

Findings:

  • A simple, controlled segmented mechanic system was developed for precise orthodontic tooth movement.
  • This system allows for definable and predictable force systems, enabling confident treatment outcome prediction.

Implications:

  • This approach enhances the predictability of orthodontic treatment outcomes, particularly in managing extraction spaces.
  • It offers a reliable method for achieving specific orthodontic goals related to tooth positioning and occlusion.