Violent is related to Fight. Attack is a type of Fight. Attack is a synonym of Affect. Affect is a synonym of Impact. 
Physical is related to Science. Science is a different concept from English. 
Violent <--RelatedTo--> Fight <--IsA-- Attack <--Synonym--> Affect <--Synonym--> Impact 
Physical <--RelatedTo--> Science <--DistinctFrom--> English 