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2. The phenomenon of friction
Adhesion
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Adhesion is the attractive forces between molecules of two different materials or the bond between two materials or bodies.
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Fig. 2.09
Rather difficult when the surface of
your hands are dry!
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Fig. 2.10
With moist hand surfaces
and moist foot soles, up we go!
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Fig. 2.11
Plexiglas wedges with a 30°-130° inner angles
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You can do an interesting experiment on friction and adhesion with these Plexiglas wedges. Try to lift the wedges with your fingers. If your fingers are dry, you will not be
able to lift even the wedge with the narrowest angle. But if your fingers are slightly moist, then you can. In addition, you can observe that adhesive friction depends on the contact surfaces.
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Fig. 2.12
Adhesive grip
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Fig. 2.13
A larger contact surface increases the adhesion
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 Fig. 2.14
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Fig. 2.15
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When chopping wood, you spit on your hands to keep a grip in the axe handle.
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 Back
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images/stories/TE1410EN.pdf
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