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Related Concept Videos

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When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
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People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is...
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Rolling With Slipping01:14

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Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
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Image-based Lagrangian Particle Tracking in Bed-load Experiments
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Don't get off the track.

Rod Foroozan1, Andrew G Lee2

  • 1Baylor College of Medicine, Houston, Texas, USA.

Survey of Ophthalmology
|May 24, 2017
PubMed
Summary
This summary is machine-generated.

Head trauma can cause optic tract syndrome, leading to vision loss. Delayed MRI revealed right optic tract atrophy and optic nerve damage, confirming the diagnosis.

Keywords:
optic tract syndromeoptical coherence tomographytraumatic brain injuryvisual evoked potentials

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Area of Science:

  • Neuro-ophthalmology
  • Neuroscience
  • Traumatic Brain Injury

Background:

  • Head trauma can result in delayed neurological deficits.
  • Optic tract injuries are a potential consequence of head trauma, affecting visual pathways.

Observation:

  • A 43-year-old male presented with decreased vision post-head trauma.
  • Initial neuroimaging was normal, but a left homonymous hemianopia was diagnosed.
  • Hemifield visual evoked potentials confirmed the visual field defect originating from the right optic tract.

Findings:

  • Four months post-trauma, MRI revealed significant atrophy of the right optic tract.
  • Funduscopy showed optic disk pallor and reduced retinal nerve fiber layer thickness.
  • These findings are consistent with a diagnosis of optic tract syndrome.

Implications:

  • This case highlights the importance of considering optic tract syndrome in patients with visual deficits after head trauma, even with initially normal imaging.
  • Delayed neuroimaging and specialized visual field testing are crucial for accurate diagnosis.
  • Optic tract atrophy and subsequent vision loss underscore the vulnerability of visual pathways to traumatic brain injury.