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Rigid Body Equilibrium Problems - II

Rigid Body Equilibrium Problems - II

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 - I

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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.

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Related Experiment Video

Updated: Jun 17, 2026

Experimental Methods to Study Human Postural Control

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

Interpersonal postural coordination on rigid and non-rigid surfaces.

Thomas A Stoffregen¹, M Russell Giveans, Sebastien Villard

¹Dept. of Kinesiology, University of Minnesota, Minneapolis, MN, USA.

|December 18, 2009

Summary

When conversing with a partner, people exhibit increased shared postural activity on stable surfaces. This interpersonal coupling strengthens over time during mutual conversation, but not with confederates.

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Last Updated: Jun 17, 2026

Experimental Methods to Study Human Postural Control

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Published on: September 11, 2019

Postural Organization of Gait Initiation for Biomechanical Analysis Using Force Platform Recordings

Postural Organization of Gait Initiation for Biomechanical Analysis Using Force Platform Recordings

Published on: July 26, 2022

Computerized Dynamic Posturography for Postural Control Assessment in Patients with Intermittent Claudication

Computerized Dynamic Posturography for Postural Control Assessment in Patients with Intermittent Claudication

Published on: December 11, 2013

Area of Science:

Psychology
Human Behavior
Biomechanics

Background:

Human interaction involves complex nonverbal communication.
Postural activity can reflect underlying cognitive and social processes.

Purpose of the Study:

To investigate how interpersonal interaction affects shared postural activity.
To examine the role of surface stability in modulating this effect.

Main Methods:

Pairs of participants engaged in conversations.
Conversations occurred either with a partner or a confederate.
Participants stood on rigid and nonrigid surfaces to measure postural sway.

Main Results:

Shared postural activity was higher when participants conversed with each other versus confederates on a rigid surface.
Interpersonal coupling increased across trials only when participants conversed with each other.
No significant difference in shared postural activity was found on the nonrigid surface.

Conclusions:

Mutual conversation enhances shared postural activity and interpersonal coupling on stable surfaces.
Surface instability may disrupt the manifestation of this social-postural coordination.
These findings suggest that embodied cognition plays a role in social interaction.