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Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
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A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
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Functional Classification of Joints
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Relative Motion Analysis using Rotating Axes01:25

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
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Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
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Relative Motion Analysis using Rotating Axes - Acceleration01:22

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
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Related Experiment Video

Updated: May 1, 2026

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ErgoReport: A Holistic Posture Assessment Framework Based on Inertial Data and Deep Learning.

Diogo R Martins1, Sara M Cerqueira1, Ana Pombeiro2

  • 1Center for MicroElectroMechanical Systems (CMEMS), University of Minho, 4800-058 Guimarães, Portugal.

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|April 12, 2025
PubMed
Summary

This study introduces a new framework using deep learning and inertial data to automatically assess ergonomic risk from awkward postures. It helps identify risky postures, improving worker safety and task redesign.

Keywords:
deep learningergonomic risk assessmentinertial-based posture recognitionposture monitoringwork-related musculoskeletal disorders

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Area of Science:

  • Occupational Health and Safety
  • Ergonomics
  • Biomechanical Engineering

Background:

  • Work-related musculoskeletal disorders (WRMSDs) pose significant social and economic burdens.
  • Current posture assessment tools are time-consuming and lack detailed risk breakdowns.
  • Automating and quantifying posture risk assessment is crucial for effective intervention.

Purpose of the Study:

  • To develop a holistic posture assessment framework using deep learning and inertial data.
  • To quantify ergonomic risk and qualitatively identify postures contributing to WRMSDs.
  • To create an intuitive graphical user interface (GUI) for reporting and worker education.

Main Methods:

  • Utilized inertial data for continuous posture assessment.
  • Applied Deep Learning algorithms to quantify ergonomic risk and identify postures.
  • Incorporated a kinematic wear model to assess cumulative joint stress.
  • Developed a GUI for visualizing ergonomic scores and associated postures.

Main Results:

  • The framework successfully quantified ergonomic risk and identified specific postures.
  • A GUI was generated, intuitively linking ergonomic scores to postures.
  • The system empowered users to understand and address risky postures.
  • Ergonomists found the report highly useful for improving assessment effectiveness and efficiency.

Conclusions:

  • The developed framework offers a powerful tool for holistic posture assessment.
  • It enhances the effectiveness, speed, and usability of ergonomic assessments.
  • The system aids in redesigning work tasks to mitigate WRMSD risks.