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Related Concept Videos

Stability of structures01:14

Stability of structures

In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
Stability01:28

Stability

The time response of a linear time-invariant (LTI) system can be divided into transient and steady-state responses. The transient response represents the system's initial reaction to a change in input and diminishes to zero over time. In contrast, the steady-state response is the behavior that persists after the transient effects have faded.
The stability of an LTI system is determined by the roots of its characteristic equation, known as poles. A system is stable if it produces a bounded...
Pole and System Stability01:24

Pole and System Stability

The transfer function is a fundamental concept representing the ratio of two polynomials. The numerator and denominator encapsulate the system's dynamics. The zeros and poles of this transfer function are critical in determining the system's behavior and stability.
Simple poles are unique roots of the denominator polynomial. Each simple pole corresponds to a distinct solution to the system's characteristic equation, typically resulting in exponential decay terms in the system's response.
Stability of Equilibrium Configuration01:23

Stability of Equilibrium Configuration

Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...
Stability of Equilibrium Configuration: Problem Solving01:13

Stability of Equilibrium Configuration: Problem Solving

The stability of equilibrium configurations is an important concept in physics, engineering, and other related fields. In simple terms, it refers to the tendency of an object or system to return to its equilibrium position after being disturbed. The stability of an equilibrium configuration can be analyzed by considering the potential energy function of the system and examining its behavior near the equilibrium point.
Problem-solving in the context of the stability of equilibrium configuration...
Self-Evaluation Maintenance Model01:29

Self-Evaluation Maintenance Model

The Self-Evaluation Maintenance (SEM) model offers a psychological framework to understand how individuals’ self-esteem is influenced by the achievements of others, particularly those with whom they share close personal bonds. The SEM model operates when personal rather than social identity guides individuals. Central to this model is the notion that individuals have an inherent desire to preserve a favorable self-image, which is continuously shaped by interpersonal comparisons and...

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Related Experiment Video

Updated: May 8, 2026

Evaluating the Function of the Foot Core System in the Elderly
08:25

Evaluating the Function of the Foot Core System in the Elderly

Published on: March 11, 2022

Development of a core-stability model: a delphi approach.

Tricia Majewski-Schrage1, Todd A Evans, Brian Ragan

  • 1Dept of Athletic Training, University of Northern Iowa, Cedar Falls, IA.

Journal of Sport Rehabilitation
|August 29, 2013
PubMed
Summary

Experts established a consensus definition for core stability, identifying muscles and neuromuscular control as key components. However, consensus on assessment techniques was not reached, highlighting existing inconsistencies.

Related Experiment Videos

Last Updated: May 8, 2026

Evaluating the Function of the Foot Core System in the Elderly
08:25

Evaluating the Function of the Foot Core System in the Elderly

Published on: March 11, 2022

Area of Science:

  • Kinesiology
  • Exercise Science
  • Rehabilitation

Background:

  • Core stability lacks a universally agreed-upon definition, components, and measurement techniques.
  • This ambiguity hinders consistent research and clinical application.

Purpose of the Study:

  • To establish a comprehensive model for core stability, including its definition, components, and assessment methods.
  • To address the lack of consensus in the scientific and clinical communities.

Main Methods:

  • Utilized the Delphi technique with 15 multidisciplinary experts from the US and Canada.
  • Collected data through open-ended questionnaires and two rounds of telephone interviews.
  • Achieved consensus based on 51% agreement among respondents.

Main Results:

  • A working definition of core stability was developed and accepted: the ability to control the trunk during rest and movement.
  • Experts agreed on muscles (93.3%) and neuromuscular control (66.7%) as core stability components.
  • Identified various assessment techniques but failed to reach a consensus on specific methods.

Conclusions:

  • A consensus definition and two components of core stability were established.
  • Significant inconsistencies in understanding and assessment techniques among experts were revealed.
  • The study provides a foundation for future research and standardization of core stability assessment.