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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...
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Rolling Resistance: Problem Solving01:17

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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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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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Equation of Motion: General Plane motion - Problem Solving01:16

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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?
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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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When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
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Measuring Rolling Friction at the Nanoscale.

Simon Scherrer1, Shivaprakash N Ramakrishna1, Vincent Niggel1

  • 1Department of Materials, ETH Zürich, Zürich 8093, Switzerland.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 18, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a new colloidal probe microscopy method to measure rolling friction at the nanoscale. The technique uses microfabricated holders to allow particles to roll and slide, enabling new characterization of particle interactions.

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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Tribology

Background:

  • Colloidal probe microscopy is crucial for nanoscale friction measurements but typically only measures sliding.
  • Existing methods cannot capture rolling friction, which is important in particle-based material processing.
  • There is a need for techniques that can measure both rolling and sliding friction.

Purpose of the Study:

  • To develop a novel methodology for measuring lateral forces during rolling contacts using colloidal probe microscopy.
  • To enable the simultaneous measurement of sliding and rolling friction at the nanoscale.
  • To provide a new tool for characterizing particle surface properties and functional coatings.

Main Methods:

  • Adaptation of colloidal probe microscopy with microfabricated holders for free particle rotation.
  • Utilizing two-photon polymerization direct laser writing for holder fabrication.
  • Employing optically heterogeneous particles to detect rotation during lateral scanning with atomic force microscopy (AFM).

Main Results:

  • Demonstrated a new method to measure lateral forces in rolling contacts.
  • Successfully enabled simultaneous measurement of sliding and rolling friction.
  • Reported rolling friction data as a function of probe particle surface roughness.

Conclusions:

  • The developed methodology allows for the characterization of rolling contacts at the nanoscale.
  • This technique opens new avenues for engineering particle surface properties.
  • It is valuable for characterizing functional coatings based on their rolling friction behavior.