Smooth surface
No it does not have to be smooth.
The rough surface is better than the smooth surface for the frictional force to act.
The epiphyses of long bones are covered by hyaline cartilage, also known as articular cartilage. This cartilage provides a smooth surface for articulation at the joints and helps reduce friction during movement.
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
Normal articulation refers to the proper alignment and movement of the joint surfaces, allowing smooth and efficient motion. Displaced articulation occurs when the joint surfaces are not properly aligned, leading to abnormal movement and potential joint dysfunction. This displacement can result from injury, trauma, or underlying medical conditions.
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.