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Related Concept Videos

Virtual Work01:20

Virtual Work

The principle of virtual work states that if a body is in static and dynamic equilibrium, then the sum of all the virtual work done by all external forces and couple moments for any given virtual displacement must be zero.
In static equilibrium, a body can experience an imaginary or virtual movement, such as displacement or rotation. The virtual work done by a force is equal to the dot product of force and virtual displacement in the direction of the force. When it comes to virtually rotating a...
Social Loafing01:37

Social Loafing

Another way in which a group presence can affect performance is social loafing—the exertion of less effort by a person working together with a group. Social loafing occurs when our individual performance cannot be evaluated separately from the group. Thus, group performance declines on easy tasks (Karau & Williams, 1993). Essentially individual group members loaf and let other group members pick up the slack. Because each individual’s efforts cannot be evaluated, individuals become less...
Quantifying Work02:30

Quantifying Work

As a system undergoes a change, its internal energy can change, and energy can be transferred from the system to the surroundings, or from the surroundings to the system.
Work01:22

Work

Work is done when energy is transferred from one object to another. In other words, work is when a force acts on something that undergoes a displacement from one position to another. Forces can vary as a function of position, and displacements can be along various paths between two points. The increment of work (dW) done by a force acting through an infinitesimal displacement can be defined as the dot product of force () and displacement () vectors.
The dot product can be expressed in terms of...
Work01:14

Work

Work is a fundamental concept of mechanical engineering and has many applications. Understanding how work is calculated and the different types of work can help us better understand physical processes and provide insights into complex problems.
Work is defined as the result of a force acting on an object, causing it to move along the line of action of force. It is also defined as the process of transferring energy through the application of force on an object, resulting in its displacement.
Work Done by Many Forces01:03

Work Done by Many Forces

The total work done on an object acted upon by multiple forces can be computed using two methods that give the same result. In one method, the work done by each force is first calculated. Then, those values are summed algebraically to calculate the total work done by all the forces. In the second method, the net force is first calculated by a vector sum of all the forces. Then, the work done by this force is obtained.
Since forces perpendicular to the displacement do no work, they do not...

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Updated: Jul 6, 2026

Three-Dimensional Mapping of the Rotation of Interactive Virtual Objects with Eye-Tracking Data
06:36

Three-Dimensional Mapping of the Rotation of Interactive Virtual Objects with Eye-Tracking Data

Published on: October 18, 2024

[Workers risky for others on the Web].

M Cannas1, G Magnavita, N Magnavita

  • 1Specialista in Medicina del Lavoro, Fano. mcannas@hotmail.com

Giornale Italiano Di Medicina Del Lavoro Ed Ergonomia
|April 16, 2008
PubMed
Summary

The study found increasing discussion among Italian Competent Physicians (CPs) regarding hazardous workers (HWs) whose health conditions may pose risks. This highlights a growing need for systematic approaches and guidelines for managing HWs in the workplace.

Area of Science:

  • Occupational Health
  • Medical Ethics
  • Workplace Safety

Context:

  • Hazardous workers (HWs) present unique challenges to workplace safety and health.
  • Competent Physicians (CPs) are responsible for assessing the fitness for work of HWs.
  • Online forums serve as platforms for CPs to discuss complex occupational health issues.

Purpose:

  • To analyze the frequency and nature of discussions concerning hazardous workers (HWs) within the online community of Italian Competent Physicians (CPs).
  • To identify emerging themes, stakeholder involvement, and ethical dilemmas related to HWs in occupational health surveillance.
  • To assess the current discourse and identify the need for structured guidance for CPs.

Summary:

  • Analysis of online forum discussions reveals a growing attention to the issue of hazardous workers (HWs) among Italian Competent Physicians (CPs).

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Methods to Test Visual Attention Online
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Methods to Test Visual Attention Online

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Three-Dimensional Mapping of the Rotation of Interactive Virtual Objects with Eye-Tracking Data
06:36

Three-Dimensional Mapping of the Rotation of Interactive Virtual Objects with Eye-Tracking Data

Published on: October 18, 2024

Methods to Test Visual Attention Online
09:44

Methods to Test Visual Attention Online

Published on: February 19, 2015

  • Discussions indicate the involvement of various stakeholders and highlight ethical considerations in managing HWs.
  • The findings suggest a need for a more systematic approach and the development of specific guidelines for CPs.

    • Impact:

    • Informs occupational health professionals about the evolving discourse on hazardous workers.
    • Underscores the importance of addressing ethical dilemmas in worker fitness assessments.
    • Provides a basis for developing standardized guidelines to support Competent Physicians in managing hazardous workers effectively.