Back tire (something) banging all the time

Hi
I am new so i will just try explain the problem and thanks in advance for any help

I have a 2000 Cavalier, low kms etc, and i have had it for a year and it seems that when i drive, over smooth or rough surfaces (any bumps), my back right tire or shock seems to make a noise like it is just flopping around or like a bouncing noise of some sort

any ideas?

Shocks and struts wear with age too, not only distance. If it's oily at all, replace both. If not, see if you can replicate the noise by bouncing it on the ground and listening for exactly where it's coming from.