When you roll a smooth marble on a smooth surface, why does it still make a noise when no impact is occurring?

Question

...there is no collision occuring. Each point of the marble that touches the surface does so at almost zero vertical speed (the speed of the marble is going forward).

Answer 1

The same reason that the marble slows down and stops eventually. The - however small - collisions between the marble and the surface is both making the noise and causing the friction force that slows the marble down

Answer 2

Neither the marble nor the surface are exactly smooth...they may appear so to the naked eye, but if you looked with a microscope you'd see that the surfaces of both are probably pitted and rough. That makes your noise. Also the marble is probably not perfectly round (nothing made in gravity is perfectly round), which would also contribute to the noise factor.

Answer 3

interesting

of course the answer is that what you call "smooth", is not smooth at all. So the marble will bump (microscopically) on the surface, and vibrate, and make noise.

but clearly if you've got a good set up, such as a steel ball in a steel rail, with some lubricant, you don't head much noise at all, do you?

Answer 4

In reality, the surface and the marble are not perfectly smooth so there is still a noise.

Answer 5

The surface may look smooth but it is not on the microscopic leve. Full of bumps.
Same for the marble

Answer 6

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Answer 7

Yeah, but there's still weight and contact to the surface (gravity).... unless the marble is rolled so fast that it loses contact to the surface (0 friction) and starts flying.

Answer 8

there are two resons one the marble and surface aren't perfectly smooth two the marble is moving on the suface and not floting

Answer 9

The marble is still making contact with the surface and not floating in space. Therefore, you still have friction.

Answer 10

You're rolling the marble...that's energy. It's impacting the table with each roll...