friction

3 articles · All tags

• How Zippers Work: Teeth, Slider and Interlocking Chain
  A zipper closes when a sliding wedge presses two rows of teeth together so each tooth locks into the gap opposite. Here is how the slider and teeth work.
• Why Is Ice Slippery? The Thin Liquid Layer Explained
  Ice is slippery because a thin, disordered layer of water on its surface acts like a liquid even below freezing, since surface molecules have missing bonds.
• Tribology: Friction, Lubrication, and Wear
  The science of rubbing surfaces: why friction follows simple laws, how lubricant films carry loads, and why wear is the dominant failure mode of machinery.