When my car moves or/and runs on an uneven track (street or road) or moves

[Dinesh Desh]

over bumps its doors make a noise? when my car moves or/and runs on an uneven track (street or road) or moves over bumps its doors make a noise, whats the problem ?

How can i resolve the problem ?

Is it the problem of bushings and/or hinge pins ?

of what material should be the bushings, door-checks & hinge pins made up of ?

thanks in advance to all of the responders (answerers)