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Related Concept Videos

Frictional Force01:07

Frictional Force

10.7K
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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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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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.
However, if two systems are in contact and are stationary relative to one...
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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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Frictional Forces on Flat Belts01:28

Frictional Forces on Flat Belts

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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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Friction: Problem Solving01:21

Friction: Problem Solving

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Friction is an essential force that influences the motion of objects in daily life. Depending on the situation, it can be either beneficial or problematic. Consider a bus with a mass of three megagrams and its center of mass at a specific point, moving along a banked road at a constant speed. The coefficient of static friction between the tires and the road is 0.5. Find the maximum angle of the banked road at which the bus would not slip or tip.
Initially, a visual representation of the...
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Related Experiment Video

Updated: Mar 30, 2026

Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires
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Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires

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Friction in orthodontics.

P S Prashant1, Hemant Nandan1, Meera Gopalakrishnan2

  • 1Department of Orthodontics, Indira Gandhi Institute of Dental Sciences, Kothamangalam, Ernakulam, Kerala, India.

Journal of Pharmacy & Bioallied Sciences
|November 6, 2015
PubMed
Summary

Resistance to sliding (RS) in orthodontics is debated, with studies questioning traditional friction measurements. Recent findings emphasize binding and notching of archwires as key factors limiting tooth movement.

Keywords:
Bindingfrictionnotching

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Area of Science:

  • Orthodontics
  • Biomaterials Science
  • Dental Mechanics

Background:

  • Conventional orthodontic wisdom posits that resistance to sliding (RS) at the wire-bracket interface influences force transmission to teeth.
  • The roles of static and kinetic friction, and their impact on anchorage, remain subjects of ongoing debate within the field.
  • Numerous studies have investigated factors affecting friction, aiming to understand their influence on retarding tooth movement rates.

Purpose of the Study:

  • To review the components contributing to resistance to sliding (RS) in orthodontic treatment.
  • To critically evaluate factors influencing friction at the wire-bracket interface.
  • To highlight the need for research into cost-effective methods for friction reduction in orthodontics.

Main Methods:

  • Literature review of existing research on friction and resistance to sliding in orthodontics.
  • Analysis of methodologies used in previous studies, assessing their relevance to oral conditions.
  • Synthesis of current understanding regarding factors affecting friction and tooth movement.

Main Results:

  • The relevance of many existing studies is questionable due to methodologies not simulating oral conditions.
  • Recent research suggests that binding and notching of archwires are primary factors retarding tooth movement, rather than solely friction.
  • A comprehensive review of RS components and friction-influencing factors is presented.

Conclusions:

  • The traditional focus on friction in orthodontics may be misplaced.
  • Binding and notching of archwires are identified as more significant factors influencing tooth movement.
  • Further research is needed to develop cost-effective alternatives for reducing friction and improving orthodontic treatment efficiency.