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Related Concept Videos

Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
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Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
Inertial Frames of Reference01:03

Inertial Frames of Reference

Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with constant...
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Related Experiment Video

Updated: May 9, 2026

MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions
09:46

MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions

Published on: May 10, 2012

Humans perceive object motion in world coordinates during obstacle avoidance.

Brett R Fajen1, Melissa S Parade, Jonathan S Matthis

  • 1Department of Cognitive Science, Rensselaer Polytechnic Institute, Troy, NY, USA. fajenb@rpi.edu

Journal of Vision
|July 27, 2013
PubMed
Summary
This summary is machine-generated.

Human locomotion around obstacles relies on world-centered perception of object motion. This process, called flow parsing, uses visual and nonvisual cues to navigate safely, independent of self-motion.

Keywords:
flow parsinglocomotionmoving objectsobstacle avoidanceoptic flow

More Related Videos

Controlled Rotation of Human Observers in a Virtual Reality Environment
09:11

Controlled Rotation of Human Observers in a Virtual Reality Environment

Published on: April 21, 2022

Related Experiment Videos

Last Updated: May 9, 2026

MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions
09:46

MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions

Published on: May 10, 2012

Controlled Rotation of Human Observers in a Virtual Reality Environment
09:11

Controlled Rotation of Human Observers in a Virtual Reality Environment

Published on: April 21, 2022

Area of Science:

  • Human locomotion
  • Perception
  • Virtual reality

Background:

  • Locomotion navigation involves understanding object motion relative to oneself.
  • Perception of object motion can be reference frame-dependent (observer-centered vs. world-centered).

Purpose of the Study:

  • To investigate whether humans use observer-centered or world-centered reference frames to guide locomotion around moving obstacles.
  • To determine if self-motion influences the reference frame used for obstacle avoidance.

Main Methods:

  • Participants walked in a virtual environment (VE) using a head-mounted display.
  • VE manipulations altered object motion in observer coordinates while keeping world coordinates constant.
  • Participants indicated their path relative to a moving obstacle.

Main Results:

  • Locomotion around moving obstacles primarily relies on object motion perceived in world coordinates.
  • This navigation strategy involves "flow parsing" to isolate object motion from self-motion.
  • Both visual and nonvisual information are used to accurately perceive world-centered object motion during real self-motion.

Conclusions:

  • Human navigation around moving obstacles is guided by a world-centered reference frame.
  • Flow parsing is a key mechanism for extracting relevant object motion information.
  • Accurate perception of world-centered object motion is crucial for effective locomotion and obstacle avoidance.