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Related Concept Videos

Rolling Resistance01:21

Rolling Resistance

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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.
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down due to...
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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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Rolling Without Slipping01:09

Rolling Without Slipping

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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 Resistance: Problem Solving01:17

Rolling Resistance: Problem Solving

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Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
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Equation of Motion: General Plane motion - Problem Solving01:16

Equation of Motion: General Plane motion - Problem Solving

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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?
The friction between the roller and the ground is characterized by two coefficients. The static friction coefficient is 0.15, while the kinetic friction coefficient is 0.1. These values are crucial in understanding the interaction between...
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Characteristics of Dry Friction01:21

Characteristics of Dry Friction

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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.
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
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Exploring molecular-level rolling friction based on cyclodextrins for lubrication.

Jiao Wang1, Hao Cao2, Wei You3

  • 1Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou, 310058, PR China; Zhejiang-Israel Joint Laboratory of Self-Assembling Functional Materials, ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou, 311215, PR China; Center for Rehabilitation Medicine, Department of Orthopedics, Zhejiang Provincial People's Hospital, Affiliated People's Hospital, Hangzhou Medical College, Hangzhou, 310014, PR China.

Carbohydrate Polymers
|April 19, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed molecular-level rolling friction using cyclodextrins to enhance biofriction materials. This novel approach significantly reduces friction and wear, improving lubricity and wear resistance for advanced material applications.

Keywords:
Host-guest systemsMolecular-level rolling frictionPolyrotaxaneΑ-Cyclodextrin

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Tribology

Background:

  • Minimizing friction via rolling instead of sliding is effective macroscopically.
  • Achieving molecular-scale rolling friction has been a significant challenge.
  • Traditional sliding friction limits the performance of biofriction materials.

Purpose of the Study:

  • To introduce a novel strategy for molecular-level rolling friction.
  • To improve the lubricity and wear resistance of synthetic biofriction materials.
  • To explore the potential of cyclodextrin-based molecular rolling.

Main Methods:

  • Utilizing the molecular rolling effect of cyclodextrins.
  • Incorporating biocompatible α-cyclodextrin molecules as "rings" within polyrotaxane networks.
  • Comparing friction coefficients and wear rates against Ti6Al4V alloys and control systems.

Main Results:

  • Demonstrated significantly reduced friction coefficients.
  • Achieved substantially lower wear rates compared to commercial alloys and controls.
  • Successfully replaced traditional sliding friction with molecular-level rolling friction.

Conclusions:

  • Cyclodextrin-based polyrotaxane networks offer superior friction reduction and wear resistance.
  • This molecular engineering approach provides a new paradigm for designing advanced friction materials.
  • The findings open new frontiers in friction science and molecular technology.