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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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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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Frictional Forces on Screws01:17

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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.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
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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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Design Example: Deciding Thickness of Lubricating Fluid in a Shaft01:23

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft

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Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
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Bearings: Problem Solving01:24

Bearings: Problem Solving

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Understanding the calculations and concepts related to double-collar bearings is essential for engineers and designers to optimize the performance of these components in various applications. By analyzing the bearing under different conditions, one can ensure that it can withstand the forces and moments experienced during operation. This knowledge enables better decision-making when designing and selecting bearings for specific purposes and configurations. Consider a double-collar bearing with...
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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Needle Guide Friction Reduction Utilizing Contact Surface Structure.

Isaac Elijah1, Sang-Eun Song2

  • 1Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL, USA.

SM Radiology Journal
|December 13, 2024
PubMed
Summary
This summary is machine-generated.

Optimizing prostate biopsy needle guides can reduce friction, improving sample quality and patient safety. This study found that specific configurations minimize forces, potentially lowering infection risk and repeat procedures.

Keywords:
Core biopsyInsertion frictionNeedle guideProstate biopsy

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Area of Science:

  • Urology
  • Biomedical Engineering
  • Medical Device Design

Background:

  • Prostate cancer is a leading cause of male mortality.
  • Template-guided core biopsy is crucial for diagnosis.
  • Biopsy quality is affected by factors like fragmentation and needle dynamics, with suboptimal samples requiring repeat procedures, increasing patient risk.

Purpose of the Study:

  • To investigate alternative needle guide configurations for prostate biopsy.
  • To reduce frictional forces between the needle and guide.
  • To maintain adequate guidance for accurate targeting.

Main Methods:

  • Simulations using SIMULA Abaqus software.
  • Finite Element Analysis (FEA) to model needle-guide interaction.
  • Evaluation of various needle guide configurations.

Main Results:

  • Configurations with parallel contact points showed minimal friction.
  • Reduced contact surface area between needle and guide correlated with lower friction.
  • Optimized designs demonstrated reduced frictional forces compared to the control.

Conclusions:

  • Needle guide design significantly impacts friction during prostate biopsy.
  • Optimizing needle guide configuration can decrease friction and improve biopsy specimen quality.
  • Reduced friction may lead to fewer repeat biopsies and lower infection risk.