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Static Equilibrium - II

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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...

Static Equilibrium - I

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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Rigid Body Equilibrium Problems - II

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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?

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Rigid Body Equilibrium Problems - I

Rigid Body Equilibrium Problems - I

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 15, 2026

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

Static and dynamic balance control in older golfers.

William W N Tsang¹, Christina W Y Hui-Chan

¹Dept. of Rehabilitation Sciences, Hong Kong Polytechnic University, Hong Kong (SAR), China.

Journal of Aging and Physical Activity

|February 26, 2010

Summary

Older golfers demonstrate superior static and dynamic balance compared to non-golfing adults. This improved balance may stem from the dynamic weight shifts and varied terrain encountered during golf.

Related Experiment Videos

Last Updated: Jun 15, 2026

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:

Gerontology
Sports Science
Biomechanics

Background:

Aging is associated with declines in balance control.
Maintaining balance is crucial for independence and preventing falls in older adults.
Physical activities like golf may positively impact balance in seniors.

Purpose of the Study:

To compare static and dynamic balance control in older male golfers versus age-matched healthy non-golfing males.
To investigate if golf participation enhances balance in older adults.

Main Methods:

Eleven older male golfers and 12 older male non-golfers participated.
Static balance was assessed by timing single-leg stance duration.
Dynamic balance was evaluated using perturbed single-leg stance and a normalized forward-lunge test.

Main Results:

Golfers exhibited significantly longer static single-leg stance duration.
Golfers demonstrated reduced anteroposterior body sway during perturbed single-leg stance.
Golfers achieved significantly greater normalized lunge distances compared to controls.

Conclusions:

Older golfers possess superior static and dynamic balance control.
The findings suggest that the biomechanical demands of golf, including weight transfers and walking on uneven surfaces, contribute to enhanced balance.
Golf may serve as a beneficial physical activity for improving balance in the aging population.