all
The point where two surfaces meet is called an "intersection" or a "junction."
When the hills and valleys of two surfaces meet, it can cause interference patterns to form due to the interaction of light waves. This can result in areas of constructive interference where the waves reinforce each other, leading to brighter spots, and areas of destructive interference where the waves cancel each other out, creating darker spots.
how hard the surfaces push to gether the types of surfaces involved
Two rough surfaces in contact will produce more heat due to increased friction compared to two smooth surfaces or a smooth and rough surface. Adding oil between two surfaces will reduce friction and heat generation.
The level of friction between two surfaces is influenced by factors such as the roughness of the surfaces, the force pressing the surfaces together, and the type of material the surfaces are made of.
The point where two surfaces meet is called an "intersection" or a "junction."
interface
... are straight lines where two planar surfaces meet.
Valley
it if called a edge for a 3D shape
When in reference to architecture, arris refers to the sharp edge formed when two curved or flat surfaces meet. The surfaces must meet at a salient angle.
When two surfaces intersect, they form a line of intersection, which is the set of points where both surfaces meet. This line can be straight or curved, depending on the nature of the surfaces involved. The intersection is significant in geometry and calculus, as it can define boundaries or regions in three-dimensional space.
The space between two lines or surfaces that meet is called the "angle" if it refers to the measure of rotation between them, or "gap" if it refers to the physical distance separating them. In geometric terms, angles are typically measured in degrees or radians. If the surfaces are not intersecting, the term "clearance" might also be used to describe the space between them.
The friction that two surfaces excert on each other when they rub against each other is called a friction.
Angle is a space between two lines or surfaces that meet at one point, which you measure in degrees.
vertexes
two rough surfaces