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Elastic Collisions: Case Study01:15

Elastic Collisions: Case Study

Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
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Related Experiment Video

Updated: May 10, 2026

Assessing Human Spatial Navigation in a Virtual Space and its Sensitivity to Exercise
06:17

Assessing Human Spatial Navigation in a Virtual Space and its Sensitivity to Exercise

Published on: January 26, 2024

Handles lost in non-reachable space.

Ettore Ambrosini1, Marcello Costantini

  • 1Laboratory of Neuropsychology and Cognitive Neuroscience, Department of Neuroscience and Imaging, University G. d'Annunzio, Via dei Vestini 33, 66013 Chieti, Italy.

Experimental Brain Research
|June 15, 2013
PubMed
Summary
This summary is machine-generated.

Objects are perceived as graspable when within actual reaching space. This study confirms that object accessibility, not perceived reach, influences action planning, supporting embodied cognition theories.

Related Experiment Videos

Last Updated: May 10, 2026

Assessing Human Spatial Navigation in a Virtual Space and its Sensitivity to Exercise
06:17

Assessing Human Spatial Navigation in a Virtual Space and its Sensitivity to Exercise

Published on: January 26, 2024

Area of Science:

  • Cognitive Psychology
  • Perception-Action
  • Embodied Cognition

Background:

  • Previous research suggests objects within reaching space are perceived as graspable.
  • Existing studies often use virtual objects, limiting ecological validity.
  • The role of actual versus perceived reaching ability in object interaction remains unclear.

Purpose of the Study:

  • To investigate the spatial alignment effect with real objects at varying distances.
  • To determine if actual or perceived reaching ability modulates object accessibility.
  • To explore the influence of object accessibility on potential action activation.

Main Methods:

  • Utilized a spatial alignment effect paradigm with a real object (mug).
  • Presented the object at four distances: near-reaching, actual-reaching, perceived-reaching, and non-reaching space.
  • Participants responded with the left or right hand to the object's presentation.

Main Results:

  • A spatial compatibility effect was observed only when the object was in near-reaching and actual-reaching spaces.
  • No significant effect was found for perceived-reaching or non-reaching spaces.
  • This indicates that actual physical accessibility, not estimation, is key.

Conclusions:

  • Object accessibility, determined by actual reaching ability, modulates the activation of potential actions.
  • Perceived reaching space does not influence the perception of object graspability.
  • Findings support embodied cognition, where action and perception are tightly integrated.