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Related Concept Videos

Rolling With Slipping01:14

Rolling With Slipping

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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.
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can...
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Somatosensation01:33

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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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Kinetic Friction01:26

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Consider a truck trying to pull a stationary car. As the truck exerts a force on the car, static friction is created at the point of contact between the two surfaces. This frictional force resists the car's movement and keeps it at rest. However, when the applied force by the truck surpasses the limiting static frictional force, an interesting phenomenon occurs. The frictional force at the interface reduces to a lower value, known as the kinetic frictional force. At this point, the car...
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Types of Friction Problems01:27

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Friction is an essential concept in physics, engineering, and everyday life. It is the force that opposes the relative motion or tendency of such motion between two surfaces in contact. One of the most common types of friction encountered in various applications is dry friction. Dry friction problems can be broadly categorized into three types, each with unique characteristics and challenges.
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Static and Kinetic Frictional Force01:05

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One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
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Rolling Without Slipping01:09

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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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Related Experiment Video

Updated: Sep 2, 2025

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback
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Efficient tactile encoding of object slippage.

Laurence Willemet1,2, Nicolas Huloux3, Michaël Wiertlewski4

  • 1Aix-Marseille University, CNRS, ISM, Marseille, France. l.willemet@tudelft.nl.

Scientific Reports
|August 1, 2022
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Summary
This summary is machine-generated.

The nervous system rapidly decodes tactile information from fingertip skin deformation to predict object slip. This process uses a compact set of "Eigenstrains" to inform grasp adjustments and robotic designs.

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Area of Science:

  • Neuroscience
  • Robotics
  • Biomechanics

Background:

  • The human sense of touch is crucial for grip adjustment and reacting to unexpected events during object manipulation.
  • The sensorimotor system processes tactile information within 200 ms to estimate contact friction and initiate appropriate responses.
  • The high density of afferents in fingertips presents a challenge for rapid data processing.

Purpose of the Study:

  • To investigate how the nervous system processes tactile information from skin deformation during incipient slip.
  • To identify mechanisms enabling rapid prediction of object slip based on sensory input.
  • To explore the application of these findings in designing advanced robotic grippers and prosthetics.

Main Methods:

  • Measured skin deformation patterns during incipient slip under varying frictional conditions.
  • Developed a classifier to predict impending slip based on deformation patterns.
  • Analyzed the role of identified 'Eigenstrains' in tactile data processing.

Main Results:

  • Dominant skin deformation patterns effectively estimate the proximity to slip.
  • A classifier accurately predicts impending slip from early-stage deformation.
  • The prediction of slip is invariant to the specific frictional coefficient.
  • A compact set of six 'Eigenstrains' is sufficient to distinguish between stable grasp and impending slip.

Conclusions:

  • 'Eigenstrains' represent a potential neural mechanism for rapid decoding of tactile information related to grasp stability.
  • These findings offer insights into the tactile regulation of grasp.
  • The results have direct implications for the development of robotic grippers and prosthetics capable of rapid reaction to perturbations.