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Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other. [7] [8] Lubricated friction is a case of fluid friction where a lubricant fluid separates two solid surfaces. [9] [10] [11] Skin friction is a component of drag, the force resisting the motion of a fluid across the surface of a body.
Dianna Leilani Cowern (born May 4, 1989) is an American science communicator. She is a YouTuber; she uploads videos to her YouTube channel Physics Girl explaining various physical phenomena. She worked in partnership with the PBS Digital Studios from 2015 until 2020, when she discontinued her partnership. [5]
The evolution of the disk's axial precession is easily visualized in a slow motion video by looking at the side of the disk following a single point marked on the disk. The evolution of the rotation of the disk is easily visualized in slow motion by looking at the top of the disk following an arrow drawn on the disk representing its radius.
Fearing that he is being forced to live out in the wild, Ruff sends the kids into the wilderness to meet with a survival-training expert and learn the ways of the woods. The kids learn what it takes to stay alive if you are lost in the forest. On the first day, two teams of kids design and build shelters that are safe, waterproof, and windproof.
Educational Earth-science videos, animations, lessons for educators. Animations/videos have been reviewed and evaluated by scientists/specialists in the specific discipline. Free Creative Commons Attribution-NonCommercial-ShareAlike [3] IRIS Consortium: iTunesU: Multidisciplinary Lectures from universities Free (requires iTunes software ...
This theory is exact for the situation of an infinite friction coefficient in which case the slip area vanishes, and is approximative for non-vanishing creepages. It does assume Coulomb's friction law, which more or less requires (scrupulously) clean surfaces. This theory is for massive bodies such as the railway wheel-rail contact.
Abrasion is the natural scratching of bedrock by a continuous movement of snow or glacier downhill. This is caused by a force, friction, vibration, or internal deformation of the ice, and by sliding over the rocks and sediments at the base (that also causes an avalanche) that causes the glacier to move.
Stresses were made visible using photoelasticity. Contact mechanics is the study of the deformation of solids that touch each other at one or more points. [ 1 ] [ 2 ] A central distinction in contact mechanics is between stresses acting perpendicular to the contacting bodies' surfaces (known as normal stress ) and frictional stresses acting ...
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