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Related Concept Videos

Center of Gravity00:58

Center of Gravity

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The center of gravity (COG) of an object is the point where the object's total weight is considered to be concentrated. Knowing the location of the center of gravity is useful when predicting the behavior of a moving object or designing static structures. In a uniform gravitational field, the center of gravity is similar to the center of mass (COM); yet, these two points can be positioned differently. For example, the Moon's center of mass lies very close to its geometric center, but...
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Center of Gravity01:15

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The center of gravity is the point at which an object's weight appears to be concentrated and can be used to balance the object perfectly. This point is essential in mechanics as it provides information regarding a body's stability and moments of inertia. The center of gravity does not always have to fall within the shape or boundaries of the body; it may also lie outside the body in certain cases.
To determine its location, the principle of moments can be utilized by dividing the object into...
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Finding the Center of Gravity01:03

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The center of gravity of a body is an imaginary point where the body's total weight is assumed to be concentrated, and the body is perfectly balanced. The center of the mass of a body is a point at which the whole of the mass of the body appears to be concentrated. If the acceleration due to gravity, g, has the same value at all points on a body, its center of gravity is identical to its center of mass. The center of gravity of homogeneous bodies such as a sphere, cube, or rectangular plate...
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Internal Forces and Center of Gravity01:25

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Internal forces and the center of gravity are fundamental concepts in mechanics, playing a crucial role in understanding the behavior and stability of structures and objects under various conditions. A comprehensive understanding of these principles is essential for engineers, architects, and designers to create safe and efficient systems.
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Fatigue01:21

Fatigue

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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Responses to Gravity and Touch02:26

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Gravitropism: Plant Responses to Gravity
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Related Experiment Video

Updated: Feb 2, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
08:36

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

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Center of Gravity Tracker for Operator Fatigue Detection.

Elliot Owen, Tomohiro Maeda, Ziwen Jiang

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |November 17, 2018
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    Summary

    Monitoring driver fatigue using a novel, low-cost Center of Gravity (CoG) detection system shows promise for improving heavy machinery safety. This system tracks operator position to non-invasively detect fatigue, potentially reducing accidents.

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    Area of Science:

    • Engineering
    • Human Factors
    • Occupational Safety

    Background:

    • Driver fatigue poses significant risks, leading to accidents in heavy machinery operation.
    • Current methods for fatigue detection may be invasive or lack precision.
    • Operator position, specifically Center of Gravity (CoG), is a potential non-invasive indicator of fatigue.

    Purpose of the Study:

    • To develop and validate a low-cost system for non-invasively monitoring the Center of Gravity (CoG) of seated heavy machinery operators.
    • To enable further research into the correlation between CoG shifts and driver fatigue.

    Main Methods:

    • Prototyped a research tool utilizing four sensors integrated into a seat's legs to track operator CoG.
    • Designed a novel flexure structure to shield load cells from mechanical stresses (shocks, tensile, and shear forces).
    • Validated the accuracy and precision of the developed CoG tracking system.

    Main Results:

    • Successfully developed a low-cost, integrated CoG detection system for seated drivers.
    • The flexure structure effectively protected the load cells, ensuring system durability and reliability.
    • The system demonstrated accuracy and precision in tracking CoG, laying the groundwork for fatigue research.

    Conclusions:

    • The developed low-cost CoG detection system is a viable tool for non-invasively monitoring seated operator position.
    • This technology facilitates future research into using CoG as a reliable indicator for detecting driver fatigue.
    • The system has the potential to enhance safety protocols for heavy machinery operators.