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Nothing is supposed to touch but if smoe of the mechanical parts loosen or get out of alignment then they can touch the disc and do exactly what you're describing. If you have ever heard the expression disc crash applied to a computer that is exactly the same thing; something touched the disc that shouldn't have.

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it happens very often to me when the disk stops playing the cd?dvd player lays it back into the tray and they dont slow down the just lay on the tray and skid to a stop

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When the damage is circular, it's most likely a mechanical problem. Just do a Google Image search for "crashed hard drive" to see what happens when the hardware fails. Humans do have a hard time drawing a perfect circle, after all.

When scratches are perpendicular to rotation, it's most likely a human problem. I would almost say "always" a human problem, except in cases where you're dealing with car CD players. That slot is notorious for getting the tiniest bits of dust/gravel caught in the opening, then when the disc is pulled in (or pushed out) straight, you get a nice big scratch.

The good news is, you can go to just about any Hollywood Video or Blockbuster and ask them to clean your discs for you for free. Even if they're just CD's. Usually they're bored enough, and they have a really fancy machine that'll make 'em look brand new in under 20 seconds, unless they are seriously beyond repair. But light surface scratches buff out really well :)

Source: 3 years at a Hollywood Video, 2 years as a CD-ROM tester, 2 years in CD-ROM tech support

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Just wanted to add to my answer above -
During my time at the video store, a guy walked in, pulled a DVD out of his PANTS POCKET, and asked me to clean the scratches off of it for him.

I just said, "What for?"

Bet there were some pretty good radial scratches on that puppy ;)

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