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Rolling With Slipping

Rolling With Slipping

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 affect...

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 essential...

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.
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Flow Table Test

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The flow table test is an established method used to assess the workability of concrete, particularly useful for evaluating highly flowable concrete mixes. This test employs an apparatus that consists of a wooden board topped with a steel plate, collectively weighing 35 pounds. The board is connected to a base via a hinge and measures 27.6 inches on each side.
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Related Experiment Video

Updated: May 31, 2026

Imaging Molecular Adhesion in Cell Rolling by Adhesion Footprint Assay

Imaging Molecular Adhesion in Cell Rolling by Adhesion Footprint Assay

Published on: September 27, 2021

Pass the jelly rolls.

Reza Khayat¹, John E Johnson

¹Department of Molecular Biology, The Scripps Research Institute, La Jolla, CA, USA.

Structure (London, England : 1993)

|July 12, 2011

Summary

This summary is machine-generated.

The vaccinia virus D13 protein

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Area of Science:

Structural biology
Virology
Molecular evolution

Background:

The vaccinia virus D13 protein's crystal structure reveals fused "virus jelly roll" folds.
These folds are common in double-stranded DNA (dsDNA) icosahedral viruses.

Discussion:

The D13 protein, absent in mature vaccinia virus, shares structural similarities with ancient viral ancestors.
This suggests an evolutionary link between modern viruses and early icosahedral forms.

Key Insights:

The study elucidates the structural basis of viral protein evolution.
Identifies conserved structural motifs across diverse dsDNA viruses.

Outlook:

Further research into viral protein structures can illuminate evolutionary pathways.
Understanding these ancestral structures may aid in developing novel antiviral strategies.