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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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Characteristics of Dry Friction01:21

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Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
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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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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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Rolling Resistance01:21

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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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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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Lower-Limb Biomechanical Characteristics Associated with Unplanned Gait Termination Under Different Walking Speeds
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Gait Characteristics When Walking on Different Slippery Walkways.

Mariah W Whitmore1, Levi J Hargrove2, Eric J Perreault3

  • 1Department of Biomedical Engineering, Northwestern University, Evanston, IL, USA.

IEEE Transactions on Bio-Medical Engineering
|November 10, 2015
PubMed
Summary

Able-bodied individuals alter muscle activity in their lower limbs when walking on slippery surfaces. Ankle muscles decrease activity, while knee and hip muscles increase, aiding stability.

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Human Movement Science

Background:

  • Walking on slippery surfaces presents challenges, particularly for individuals with lower limb amputations.
  • Current prosthetic technology does not fully replicate the compensatory gait adjustments seen in unimpaired individuals.

Purpose of the Study:

  • To investigate changes in ankle, knee, and hip muscle activity during steady-state walking on surfaces of varying slipperiness in able-bodied individuals.
  • To understand gait modulation strategies in response to reduced surface friction.

Main Methods:

  • Electromyographic (EMG) signals were recorded from selected lower limb muscles.
  • Muscle activity was quantified to compare changes across different surface conditions.

Main Results:

  • Ankle muscles exhibited reduced activity on more slippery surfaces, promoting joint compliance for surface contact.
  • Knee and hip muscles showed increased activity on slippery surfaces, leading to greater flexion.
  • These proximal joint adjustments likely lower the center of mass and stabilize the leg and trunk.

Conclusions:

  • A proximal-to-distal gradient in muscle activity control was observed during slippery surface walking.
  • Findings provide insights into gait adaptation strategies valuable for designing advanced prosthetic controllers.