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Related Concept Videos

Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
However, if two systems are in contact and are stationary relative to one...
Introduction to force01:25

Introduction to force

Consider water flowing from a nozzle to a turbine vane. As the water hits the turbine vane, it exerts a force that causes it to move along the flow of direction. Force is an impact that changes an object's motion, shape, or orientation. Forces can be caused by physical contact, such as a push or pull, or through non-contact interactions, such as magnetic or gravitational forces. Force is a vector quantity with both magnitude and direction, and is measured in newtons (N) in the SI unit system.
Types of Forces01:09

Types of Forces

In most situations, forces can be grouped into two categories: contact forces and field forces.  Contact forces occur as a result of direct physical contact between objects. Field forces, however, act without the necessity of physical contact between objects. They depend on the presence of a "field" in the region of space surrounding the body under consideration. You can think of a field as a property of space that is detectable by the forces it exerts. Scientists think there are only four...
Force01:06

Force

Forces affect every moment of our life. Our bodies are held to the Earth by force, and they are held together by the forces of charged particles. When we open a door, walk down a street, lift a fork, or touch a baby's face, we are applying force. Our body's atoms are held together by electrical forces, and the core of an atom, called the nucleus, is held together by the strongest force known to us—nuclear force.
The study of motion is called kinematics, but kinematics only describes the way...
Non-conservative Forces01:17

Non-conservative Forces

Non-conservative forces are dissipative forces such as friction or air resistance. These forces take energy away from a system as it progresses. Unlike conservative forces, non-conservative forces do not have potential energy associated with them. This is because the energy is lost to the system and cannot be turned into useful work later.
Also unlike their conservative counterparts, they are path-dependent; where the object starts and stops does matter. For example, a grinding wheel applies a...
Power Expended by a Constant Force00:57

Power Expended by a Constant Force

The relationship between work done and the time taken to do it can be explained using the concept of power. For example, several sprinters in a race may have the same velocity when they reach the finish line, therefore doing the same amount of work, but the winner does it in the least amount of time. Thus, power is defined as the rate of doing work. Since work can vary as a function of time, the average power is defined as the work done during a time interval, divided by the time interval.

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Related Experiment Video

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Effects of Mindfulness Training Combined with Tai Chi in Patients with Diabetic Peripheral Neuropathy
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Published on: July 14, 2023

Foot forces induced through Tai Chi push-hand exercises.

Shiu Hong Wong1, Tianjian Ji, Youlian Hong

  • 1School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, UK.

Journal of Applied Biomechanics
|August 29, 2012
PubMed
Summary

Tai Chi push-hand exercises involve low impact forces, with vertical ground reaction forces (GRFs) below body weight. The toes bear the most force, suggesting benefits for balance training in older adults.

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Area of Science:

  • Biomechanics
  • Sports Science
  • Geriatric Medicine

Background:

  • Tai Chi push-hand exercises are recognized for low impact, potentially benefiting older adults and those with arthritis.
  • Previous research has not reported on the biomechanics of Tai Chi push-hand exercises.

Purpose of the Study:

  • To investigate the ground reaction forces (GRFs) and plantar force distributions during Tai Chi push-hand exercises.
  • To compare the biomechanics of push-hand exercises with and without an opponent in a stationary stance.

Main Methods:

  • Ten male Tai Chi practitioners performed push-hand exercises.
  • Ground reaction forces (GRFs) were measured using Kistler force plates.
  • Plantar force distribution was assessed using Novel insole sensor systems.

Main Results:

  • Average maximum vertical GRF per foot was below 88% of body weight.
  • Horizontal GRFs were opposite between feet, peaking at 12% (medio-lateral) and 17% (antero-posterior) of body weight.
  • The toes sustained the greatest plantar force among nine measured areas.

Conclusions:

  • Tai Chi push-hand exercises generate lower vertical forces than walking, bouncing, jumping, or Tai Chi gait.
  • The significant force on the toes highlights potential applications in balance training for older adults.
  • Understanding these biomechanics can inform therapeutic and training protocols for specific populations.