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Related Concept Videos

Free Body Diagrams: Examples01:07

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Solving problems that involve forces is easy using free-body diagrams. A free-body diagram is a sketch showing all the external forces that are acting on an object or system. The object or system is represented by a single isolated point (or free body). Only those forces acting on it that originate outside of the object or system—the external forces—are shown. The forces are represented by vectors extending outward from the free body. Imagine a person sitting on a chair. Here, the...
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In mechanics, understanding the motion of objects is essential, and one tool that helps solve this problem is the free-body diagram. It is a simple but powerful graphical representation that succinctly represents all the forces acting on an object. A free-body diagram can represent a stationary or moving object, and is used in mechanics to explain the cause of an object's motion.
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Drawing Free-body Diagrams: Rules01:16

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The first step in describing and analyzing most phenomena in physics involves the careful drawing of a free-body diagram. Free-body diagrams are useful in analyzing forces acting on an object or system, and are employed extensively in the study and application of Newton's laws of motion. The steps to draw a free-body diagram are listed below:
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Free-body Diagrams: Problem Solving01:30

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Free-body diagrams are essential tools for physicists and engineers studying the motion of objects. Free-body diagrams are graphical representations of the object or system under consideration, and they focus solely on the essential forces acting on the object. This tool helps break down complex problems into simpler models that are easier to understand and solve.
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Virtual Work for a System of Connected Rigid Bodies01:06

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Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
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The most apparent functions of the skeletal system are support, protection, and movement. However, bone tissue also performs several other critical metabolic functions. For one, the bone matrix acts as a reservoir for a number of minerals important to the functioning of the body, especially calcium and phosphorus. These minerals, present in the bone tissue, can be released back into the bloodstream when required. Calcium ions, for example, are essential for muscle contractions and controlling...
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An Objective and Child-friendly Assessment of Arm Function by Using a 3-D Sensor
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The functional body: does body representation reflect functional properties?

Pietro Caggiano1, Gianna Cocchini2

  • 1Psychology Department, Goldsmiths University of London, New Cross, London, SE14 6NW, UK. psp01pc@gold.ac.uk.

Experimental Brain Research
|December 12, 2019
PubMed
Summary
This summary is machine-generated.

Healthy individuals consistently underestimate upper body parts and overestimate lower body parts. This consistent body distortion pattern suggests a functional link between body schema, body image, and daily actions.

Keywords:
Bodily awarenessBody actionBody imageBody representationBody schemaPosture

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Body Representation Studies

Background:

  • Research on body representation distortions in healthy individuals often focuses on specific body parts.
  • Studies examining whole-body representation have yielded contrasting findings due to varied assessment methods.
  • A unified theoretical model is needed to reconcile existing data on body part perception.

Purpose of the Study:

  • To investigate consistent aspects of whole-body representation across different assessment methods.
  • To determine if distortions in body perception are method-independent.
  • To reconcile conflicting findings and support a unified theoretical model of body representation.

Main Methods:

  • Modified Body Image Task assessing real-scale body representations and inter-part relationships.
  • Participants located body landmarks on their own imagined silhouette.
  • Experiment 2 involved estimating body part length veracity and proportionality, and assessing stereotypical representations.

Main Results:

  • A consistent pattern of distortion was observed across all experiments and conditions.
  • Upper body limbs were systematically underestimated.
  • Lower body parts were consistently overestimated.

Conclusions:

  • Findings suggest a functional relationship between body parts and daily actions influences body schema and body image.
  • The observed distortions are method-independent, supporting a unified understanding of body representation.
  • The results align with and support the co-construction model of body representation.