Results 211 to 220 of about 70,487 (267)
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Control of friction force by light observed by friction force microscopy in a vacuum
Applied Physics Express, 2016Abstract The friction force (FF) between Coumarin 6 molecules on a silicon cantilever and a sapphire single-crystal substrate was controlled by laser irradiation in a vacuum. The molecules on the tip surface of the cantilever absorbed the laser light and were photoexcited.
Michiko Sasaki, Yibin Xu, Masahiro Goto
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On the formation of friction forces
Wear, 1976Abstract The formation of friction forces in silicon carbide and corundum monocrystals is affected by plasto-elastic deformation in the contact surfaces. The criterion of deformation process intensity is the density of slip layers observed in the contact surfaces.
N.L. Golego +2 more
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Quantification of Friction Force for Dual-Axis Probe Friction Force Microscope
ASME/STLE 2009 International Joint Tribology Conference, 2009Conventional friction force microscopes (FFMs) had the disadvantage of low force sensitivity due to mechanical interference between torsion caused by friction force and deflection by normal force. In order to overcome disadvantage, we developed a dual-axis micro-mechanical probe, which measures the lateral force by the double cantilever and the ...
Hiroaki Amakawa +4 more
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Normal and Lateral Forces in Friction Force Microscopy
1995The comprehension of the behaviour of the force sensors used in Scanning Force and Friction Microscopy, when subjected to both normal and lateral forces, is fundamental for factional coefficient measurements. We have used the finite element analysis to investigate this matter, and the results have been applied within a deconvolution method for the ...
M. Labardi +4 more
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Friction Forces and Spring Forces
2001Two types of forces are discussed in this chapter: friction forces and spring forces. We start with the former and consider a simple classical experiment. Based on this experiment, general (coordinate-free) expressions for friction forces are obtained. The chapter closes with the corresponding developments for a spring force. The reason for including a
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American Journal of Physics, 1982
This article shows how to rotate a friction vector to make its component in a given direction as small as desired. Everyday unconscious applications of this method are presented along with some new demonstration equipment.
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This article shows how to rotate a friction vector to make its component in a given direction as small as desired. Everyday unconscious applications of this method are presented along with some new demonstration equipment.
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1996
Two-dimensional histogram technique is used to determine the loading dependence of friction. Multifunctional dependence F F i (F N )is observed, where the index i represents different materials or inequivalent sites. The data are found to be in agreement with simple power laws, corresponding to the single asperity regime with contact radii of 1–4nm (1 ...
E. Meyer +9 more
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Two-dimensional histogram technique is used to determine the loading dependence of friction. Multifunctional dependence F F i (F N )is observed, where the index i represents different materials or inequivalent sites. The data are found to be in agreement with simple power laws, corresponding to the single asperity regime with contact radii of 1–4nm (1 ...
E. Meyer +9 more
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Friction studies at steps with friction force microscopy
Surface and Interface Analysis, 1995Abstract In this study we investigated the contrast of lateral force at highly oriented pyrolytic graphite steps in an electrolytic environment with a scanning force and friction microscope. A characteristic enhancement of lateral force was visible.
E. Weilandt, A. Menck, O. Marti
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2010
In trying to analyze and solve mechanics problems, students often fail to include friction forces altogether, have them pointing in the wrong direction, or fail to have them reverse direction when the direction of motion changes. Research has shown that some students do not know (or believe) that there is a specific force due to friction, let alone ...
Charles W. Camp, John J. Clement
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In trying to analyze and solve mechanics problems, students often fail to include friction forces altogether, have them pointing in the wrong direction, or fail to have them reverse direction when the direction of motion changes. Research has shown that some students do not know (or believe) that there is a specific force due to friction, let alone ...
Charles W. Camp, John J. Clement
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Direction of the Friction Force
Nature, 1957IT is universally assumed that the force resisting the sliding of one body over another acts in a direction opposite to the relative velocity. However, no recent test of this law appears to have been carried out, and it seemed worth while setting up a simple experiment to measure any possible transverse component of the friction force.
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