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Related Concept Videos

Static Equilibrium - I01:05

Static Equilibrium - I

A rigid body is said to be in dynamic equilibrium when both its linear and angular acceleration are zero, relative to an inertial frame of reference. This means that a body in equilibrium can be moving, but only when its linear and angular velocities are constant. A rigid body is said to be in static equilibrium when it is at rest in the selected frame of reference. The distinction between static equilibrium (e.g., a state of rest) and dynamic equilibrium (e.g, a state of uniform motion) is...
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A rigid body is in static equilibrium when the net force and the net torque acting on the system are equal to zero.
Consider two children sitting on a seesaw, which has negligible mass. The first child has a mass (m1) of 26 kg and sits at point A, which is 1.6 meters (r1) from the pivot point B; the second child has a mass (m2) of 32 kg and sits at point C. How far from the pivot point B should the second child sit (r2) to balance the seesaw?
Rigid Body Equilibrium Problems - I00:49

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A rigid body is said to be in static equilibrium when the net force and the net torque acting on the system is equal to zero. To solve for rigid body equilibrium problems, do the following steps.
Static Equilibrium - II01:07

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Static equilibrium is a special case in mechanics that is very important in everyday life. It occurs when the net force and the net torque on an object or system are both zero. This means that both the linear and angular accelerations are zero. Thus, the object is at rest, or its center of mass is moving at a constant velocity. However, this does not mean that no forces are acting on the object within the system. In fact, there are very few scenarios on Earth in which no forces are acting upon...
Equilibrium and Balance01:15

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The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...
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Related Experiment Video

Updated: Jul 11, 2026

A Vibrotactile Feedback Device for Seated Balance Assessment and Training
09:13

A Vibrotactile Feedback Device for Seated Balance Assessment and Training

Published on: January 20, 2019

Whole body vibration and dynamic restraint.

T Hopkins1, J O Pak, A E Robertshaw

  • 1Human Performance Research Center, Brigham Young University, Provo, Utah, USA. ty_hopkins@byu.edu

International Journal of Sports Medicine
|September 21, 2007
PubMed
Summary

Whole body vibration (WBV) did not improve peroneus longus muscle activation or ankle stability in physically active students. Further research is needed to explore WBV

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Last Updated: Jul 11, 2026

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Published on: April 13, 2016

Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Sports Medicine

Background:

  • Ankle inversion injuries are common, and dynamic stability is crucial for prevention.
  • Whole body vibration (WBV) is explored as a potential intervention to enhance neuromuscular control.
  • The peroneus longus (PL) muscle plays a key role in ankle stabilization.

Purpose of the Study:

  • To investigate the effects of WBV on peroneus longus (PL) muscle activation after ankle inversion.
  • To determine if WBV enhances dynamic ankle stability by altering PL electromechanical delay (EMD) and reaction time.

Main Methods:

  • 22 physically active students participated, divided into WBV and control groups.
  • Measurements included PL electromechanical delay (EMD), reaction time, and muscle activation (EMG).
  • Data were collected at pre-treatment, post-treatment, and 30 minutes post-treatment intervals.

Main Results:

  • No significant group x time interactions were found for any measured variables.
  • WBV did not alter PL EMD, reaction time, peak EMG, or average EMG.
  • The study found no evidence supporting WBV for enhancing ankle dynamic stability.

Conclusions:

  • WBV was not effective in improving peroneus longus activation or ankle stability in this cohort.
  • The findings do not support the hypothesis that WBV enhances muscle spindle sensitivity for improved dynamic stability.
  • More research is required to ascertain WBV's efficacy in other injury prevention or rehabilitation contexts.