surely your physics book discusses this. Do you expect a better explanation here? Try google and you will find many articles on these topics. Come on back if they don't clear things up.
This forum is a great place to get help with specific problems, but general discussions of wide scope are better handled in your text or by google results.
Explain what is meant by i) free oscillation ii) damped oscillation iii) forced oscillation iv) resonance.
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