Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.[2] There are several types of friction:
- Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact. Dry friction is subdivided into static friction ("stiction") between non-moving surfaces, and kinetic frictionbetween moving surfaces. With the exception of atomic or molecular friction, dry friction generally arises from the interaction of surface features, known as asperities (see Figure 1).
https://en.wikipedia.org/wiki/Statcoulomb
Tuesday, September 21, 2021
09-21-2021-1501 - Gamow–Sommerfeld factor gamow factor Gamow Radium Curie George Gamow window
The Gamow factor or Gamow–Sommerfeld factor,[1] named after its discoverer George Gamow, is a probability factor for two nuclear particles' chance of overcoming the Coulomb barrier in order to undergo nuclear reactions, for example in nuclear fusion. By classical physics, there is almost no possibility for protons to fuse by crossing each other's Coulomb barrier at temperatures commonly observed to cause fusion, such as those found in the sun. When George Gamow instead applied quantum mechanics to the problem, he found that there was a significant chance for the fusion due to tunneling.
https://en.wikipedia.org/wiki/Gamow_factor
Tuesday, September 21, 2021
09-21-2021-1500 - Coulomb barrier
The Coulomb barrier, named after Coulomb's law, which is in turn named after physicist Charles-Augustin de Coulomb, is the energy barrier due to electrostatic interaction that two nuclei need to overcome so they can get close enough to undergo a nuclear reaction.
https://en.wikipedia.org/wiki/coulomb_barrier
Physics[edit]
- Electrical resistance, the measure of the degree to which a conductor opposes an electric current through that conductor
- Friction
- Drag (physics) ("air resistance"), fluid or gas forces opposing motion and flow
- Geological resistance, a measure of how well minerals resist erosive factors
- Hydraulic conductivity, the ease with which water can move through pore spaces or fractures in soil or rock
- Hardness, in materials science
- Thermal shock resistance, a measure of resistance of a material to temperature jumps.
- Thermal resistance, a measure of difficulty of heat transfer through a substance
- Thermal conductivity, how well heat is conducted through a substance
- Thermal resistance in electronics, heat considerations in electronics design
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