Try wiping the disc with a towel or tissue to rub off any dust. There are probably scratches on it. If that doesn't work, your game may have too many scratches.
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Clean it, or put it in the other way.
If it only does that for a certain disc, then the disc is probably damaged and needs to be replaced. If this happens for all discs, then there is a problem with your disc reader. If that is the case, contact Nintendo and see if they can fix your wii.
Shake the Wii very strong.
No, you cannot. Playstation games only work on the correct Playstation model. Wii games only work on the Wii. The same applies to other consoles. Placing the wrong disc into the wrong console can actually either scratch the disc badly or damage the lens inside the console.
try it and find out