what happen when metal, cloth and wood get exposed to fire

Answer 1

Why don't you find out for yourself? Ask an adult to help you expose each of these materials to a match flame or a small fire. Note that different kinds of cloth (cotton, synthetic, wool) react differently to fire.

Answer 2

Also, try to look on discoverychannel . com to look for a MythBusters episode related to that (or even on YouTube). They did an experiment related to this.