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Equation of Motion: General Plane motion01:22

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In the context of a rigid body's movement within a general plane, it is important to understand that this motion is typically triggered by external forces or couple moments exerted onto it. This principle can be explained through Newton's second law, which stipulates the translational motion of the body's center of mass along each axis.
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Consider a lawn roller with a mass of 100 kg, a radius of 0.2 meters, and a radius of gyration of 0.15 meters. A force of 200 N is applied to this roller, angled at 60 degrees from the horizontal plane. What will be the angular acceleration of the lawn roller?
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The theory of projectile motion is very useful for players of several sports to improve their performance. For example, a javelin thrower needs to throw their javelin in such a way that it travels as far as possible. The javelin thrower takes a short run-up to increase the initial speed of the javelin. The range of a projectile is at its maximum at a 45° angle so javelin throwers try to angle their throw as close to 45° as possible.
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Related Experiment Video

Updated: Feb 4, 2026

Visualizing Motion Patterns in Acupuncture Manipulation
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Visual Motion Processing in Macaque V2.

Jiaming Hu1, Heng Ma2, Shude Zhu3

  • 1Institute of Neuroscience, Chinese Academy of Sciences, and University of Chinese Academy of Sciences, Shanghai 200031, China; State Key Laboratory of Cognitive Neuroscience and Learning, IDG/McGovern Institute for Brain Research, Beijing Normal University, Beijing 100875, China; Interdisciplinary Institute of Neuroscience and Technology, Qiushi Academy for Advanced Studies, Zhejiang University, Hangzhou 310027, China.

Cell Reports
|October 4, 2018
PubMed
Summary
This summary is machine-generated.

Direction-selective neurons in visual area V2 are crucial for motion perception. These neurons exhibit smaller receptive fields and detect motion contrast, aiding in figure-ground segregation.

Keywords:
RF surroundV2direction selectivitymacaquemotion contrast

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Primate Visual System

Background:

  • Direction-selective (DS) neurons are vital for visual motion perception in primates.
  • While DS neurons in dorsal visual pathways are well-studied, their properties in other areas remain largely unknown.
  • Recent optical imaging identified DS neuron clusters in monkey visual cortex area 2 (V2).

Purpose of the Study:

  • To characterize the detailed response properties of DS neurons in macaque V2.
  • To investigate the functional role of V2 DS neurons in visual processing.
  • To compare V2 DS neuron characteristics with those in dorsal visual areas.

Main Methods:

  • Utilized optical imaging to identify clusters of DS neurons in V2.
  • Performed single-cell recordings for detailed electrophysiological characterization.
  • Compared response properties with DS neurons in areas like MT.

Main Results:

  • V2 DS neurons possess smaller receptive fields and stronger antagonistic surrounds than dorsal DS neurons.
  • These neurons are sensitive to motion contrast but do not code for speed or plaid motion.
  • DS neurons in V2 are found in distinct clusters, suggesting specialized functional units.

Conclusions:

  • V2 DS neurons play a significant role in figure-ground segregation.
  • The identified clusters of V2 DS neurons likely represent specialized systems for motion contrast detection.
  • These findings expand our understanding of the functional organization of the primate visual cortex.