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Related Concept Videos

Work01:14

Work

859
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.
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Work01:22

Work

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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...
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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.
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Factors Affecting Workability01:24

Factors Affecting Workability

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The workability of concrete is a critical characteristic that influences the ease of mixing, handling, and finishing the concrete. It is affected by several factors including water content, aggregate properties, and admixtures like air entrainment. Water plays a fundamental role as it lubricates the concrete mix, facilitating easier movement and placement. However, the water requirement varies depending on the texture and shape of aggregates. Finer particles and angular, rough-textured...
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Power01:08

Power

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The concept of work involves force and displacement; meanwhile, the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory. While none of these quantities or relations involves time explicitly, we know that the time available to accomplish work is often just as important as the amount of work itself. For example, sprinters in a race may have achieved the same velocity at the finish, therefore,...
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Work and Energy for Variable Forces01:10

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When an object is acted upon by a variable force, the amount of work done and the change in energy of the object can be more complex to calculate compared to when a constant force is applied. Work is the product of force and displacement, while energy is the capacity of a system to do work. When a constant force is applied to an object, the work done can be calculated as the product of the force and the distance moved in the direction of the force. However, when a variable force is applied, the...
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Physical Workload and Work Capacity across Occupational Groups.

Stefanie Brighenti-Zogg1,2, Jonas Mundwiler1,3, Ulla Schüpbach1

  • 1University Clinic of Internal Medicine, Cantonal Hospital Baselland, Liestal, Switzerland.

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Occupational physical activity varies significantly by job intensity, with high-intensity roles demanding more energy and steps. These physical demands, and gender differences, must inform safe return-to-work strategies.

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Area of Science:

  • Occupational Health
  • Exercise Physiology
  • Workplace Wellness

Background:

  • Understanding physical activity and energy expenditure in diverse occupations is crucial for workplace health.
  • Existing guidelines on workload limits relative to aerobic capacity (VO2max) may not accurately reflect real-world job demands.
  • Gender-specific differences in physical capacity and workload need consideration in occupational health assessments.

Purpose of the Study:

  • To determine physical performance criteria across different occupational groups.
  • To investigate physical activity and energy expenditure in relation to aerobic capacity (VO2max) in Swiss employees.
  • To analyze occupational workload in relation to VO2max and identify potential gender-related differences.

Main Methods:

  • Cross-sectional study of 303 healthy, full-time Swiss employees across low-, moderate-, and high-intensity occupational groups.
  • Objective measurement of daily steps, energy expenditure, and activity intensity using SenseWear Mini armbands over seven days.
  • Assessment of maximal aerobic capacity (VO2max) using the 20-meter shuttle run test.

Main Results:

  • High-intensity occupational groups exhibited significantly higher energy expenditure, metabolic equivalents, and steps compared to low- and moderate-intensity groups during work.
  • No significant differences in physical activity were observed between occupational groups on non-working days.
  • Upper workload limits as a percentage of VO2max were 21% (low), 29% (moderate), and 44% (high), with men showing a lower relative limit than women.

Conclusions:

  • The average workload limit (one-third of VO2max) is a misrepresentation of actual physical demands in specific occupational groups.
  • Occupational physical demands and gender-related differences in relative workload are not adequately addressed by current general guidelines.
  • Clinical practices, especially for safe return-to-work programs, must account for these occupation- and gender-specific variations in physical workload.