Child abuse, "one quater or children experience one or more forms of physical violence during childhood."
To inform people of how common child abuse actually is so people are aware of the facts.
Possibly posters, something which includes the facts, shocks people and makes them think, something emotional and hard hitting.
Schools- teachers and student, school corridors and classrooms.
Inform- to make people aware of the fraction of children that suffer from abuse, so children who are abused know they're not alone and so teachers and other professionals can look out for children.
Posters, informations/facts card.
Black and white, possibly red. Dark and serious mood to be conveyed.