No it does not have to be smooth.
Smooth surface
The rough surface is better than the smooth surface for the frictional force to act.
It is not smooth it has craters
Here we are talking about the surface of the muscles..... Smooth muscles have smooth surface while striated muscles have rough surface.....
Smooth
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smooth surface
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.
The force is greater on a rough surface compared to a smooth surface, due to the increased friction between the surfaces. The rough surface provides more resistance to motion, requiring more force to overcome the friction.
The surface tension of the water creates a smooth surface. Light, as well as images captured by the eyes, are reflected on that smooth surface.
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