The opposite of a smooth surface is a rough surface. Rough surfaces have irregularities, bumps, or texture that give them an uneven or coarse feel.
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This is known as the law of reflection, where the angle of incidence is equal to the angle of reflection. It describes how light behaves when it hits a smooth surface, such as a mirror, and reflects off it at an equal but opposite angle.
The opposite of fluffy is probably flat or smooth.
The sound would be reflected and seem to come from behind the reflective surface. This is commonly experienced near airports, where the sound of aircraft appears to come from the opposite direction, instead of from the airport.
A basketball will roll faster on a smooth surface due to less friction compared to a rough surface. The rough surface creates more resistance, slowing down the ball's movement.
The physical property that describes how smooth the surface of an object is called "texture". Texture refers to the feel or appearance of a surface, whether it is rough, smooth, bumpy, or uneven.