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2. Rolling contact fatigue - Wikipedia

   en.wikipedia.org/wiki/Rolling_contact_fatigue

   It is also a significant cause of failure in components subjected to rolling or rolling/sliding contacts, such as rolling-contact bearings, gears, and cam/tappet arrangements. [5] The alternating stress field in RCF can lead to material removal, varying from micro- and macro- pitting in conventional bearing steels to delamination in hybrid ...

3. Electric gate - Wikipedia

   en.wikipedia.org/wiki/Electric_gate

   Driveway gate openers can be the rollback (sliding) type that retracks a gate along the fence or wall on wheels or bearing, or the swing type that draws the gate open or closed on hinges. They are usually operated by a remote controller or a sensor

4. Frictional contact mechanics - Wikipedia

   en.wikipedia.org/wiki/Frictional_contact_mechanics

   Rolling contact between a cylinder and a plane. Particles moving through the contact area from right to left, being strained more and more until local sliding sets in. Rolling contact problems are dynamic problems in which the contacting bodies are continuously moving with respect to each other.

5. Rolling resistance - Wikipedia

   en.wikipedia.org/wiki/Rolling_resistance

   Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface. It is mainly caused by non-elastic effects; that is, not all the energy needed for deformation (or movement) of the wheel, roadbed, etc., is recovered when the pressure is removed.

6. Caisson (lock gate) - Wikipedia

   en.wikipedia.org/wiki/Caisson_(lock_gate)

   Ship caissons are slow to operate and so, during the Victorian period, the more efficient 'sliding caisson' (also 'floating-' [ii] or 'rolling caisson') was developed. [3] This is a permanent fixture within the dock, like a hinged dock gate, and moves upon a fixed track. The sides of the caisson are vertical, making a narrow rectangular box.

7. Sliding door - Wikipedia

   en.wikipedia.org/wiki/Sliding_door

   Some sliding doors run on a wall-mounted rail, like this one Sliding doors in a modern wardrobe. The 'top-hung' system is most often used. The door is hung by two trolley hangers at the top of the door running in a concealed track; all the weight is taken by the hangers, making the door easier to move.