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Related Concept Videos

Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

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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.
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Work and Energy for Variable Forces01:10

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When an object is acted upon by a variable force, the amount of work done and the change in energy of the object can be more complex to calculate compared to when a constant force is applied. Work is the product of force and displacement, while energy is the capacity of a system to do work. When a constant force is applied to an object, the work done can be calculated as the product of the force and the distance moved in the direction of the force. However, when a variable force is applied, the...
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Two-Dimensional Force System01:20

Two-Dimensional Force System

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A two-dimensional system in mechanical engineering involves the analysis of motion and forces in a plane. A two-dimensional force vector can be resolved into its components as:
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Kinetic Energy for a Rigid Body01:13

Kinetic Energy for a Rigid Body

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Imagine a solid object involved in a general planar movement, with its center of mass pinpointed at a spot labeled G. The object's kinetic energy relative to an arbitrary point A can be quantified for each of its particles - the ith particle in this case. This measurement is achieved through the employment of the relative velocity definition. The position vector, known as rA, extends from point A to the mass element i.
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Three-Dimensional Force System01:30

Three-Dimensional Force System

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In mechanical engineering, a three-dimensional force system is a system of forces acting in three dimensions, with forces applied along the x, y, and z coordinate axes. The three-dimensional force system is an important concept in mechanical engineering, as it allows engineers to understand and analyze the behavior of objects and structures in three dimensions. By understanding the forces acting on a system, engineers can design more efficient and effective mechanical systems that can withstand...
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Power Expended by a Constant Force00:57

Power Expended by a Constant Force

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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

Updated: Sep 12, 2025

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
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Affordable force platforms compared to commercial standards for assessing kinetic parameters: A validation study.

Ivan Baltasar-Fernandez1, Laura Martín Casado2, Inés Palomo Fernández2

  • 1GENUD Toledo Research Group, Faculty of Sports Sciences, University of Castilla-La Mancha, Toledo, Spain; Faculty of Health Sciences, University of Castilla-La Mancha, Talavera de la Reina, Spain; Grupo Mixto de Fragilidad y Envejecimiento Exitoso UCLM-SESCAM (TEC2022-007), Instituto de Investigación Sanitaria de Castilla-La Mancha (IDISCAM), Junta de Comunidades de Castilla-La Mancha (JCCM), Toledo, Spain.

Computers in Biology and Medicine
|August 10, 2025
PubMed
Summary

The affordable Pasco PS-3229 force platform accurately measures kinetic parameters in young and older adults, showing high validity and reliability comparable to commercial standards for gait, sit-to-stand, and jump tasks.

Keywords:
BiomechanicsCounter movement jumpForce platformGaitSit-to-stand

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

Published on: July 26, 2022

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Area of Science:

  • Biomechanics
  • Kinesiology
  • Sport Sciences

Background:

  • Force platforms are crucial for measuring kinetic parameters in human movement analysis.
  • High costs of commercial force platforms limit accessibility in research and sports science.
  • Affordable alternatives are needed to validate kinetic measurements.

Purpose of the Study:

  • To evaluate the validity and reliability of the Pasco PS-3229 force platform.
  • To compare kinetic parameter measurements against a gold-standard commercial force platform.
  • To assess the platform's utility in both young and older adult populations.

Main Methods:

  • Twenty participants (10 young, 10 older adults) performed habitual gait, sit-to-stand, and countermovement jump tasks.
  • Kinetic parameters (time, impulse, peak force) were measured simultaneously using the Pasco platform and a gold-standard platform.
  • Data were analyzed using correlation coefficients, intraclass correlation coefficients (ICCs), and Bland-Altman analysis.

Main Results:

  • High correlations (r=0.99) and ICCs (ICC=0.99) were found between the Pasco and gold-standard platforms for all tasks and age groups.
  • Bland-Altman analysis indicated minimal bias and narrow limits of agreement.
  • Observed differences in kinetic values were trivial (d<0.1), suggesting high agreement.

Conclusions:

  • The Pasco PS-3229 force platform is a valid and reliable tool for assessing kinetic parameters.
  • It demonstrates minimal error and comparable performance to commercial standards.
  • This affordable option is suitable for biomechanical research involving both young and older adults.