Affair is related to Divorce. Divorce is a synonym of Separate. Segment is a type of Separate. Segment is related to Episode. 
Force is related to Momentum. Momentum is a synonym of Impulse. Impulse is a synonym of Stimulus. Stimulus is a synonym of Influence. 
Affair <--RelatedTo--> Divorce <--Synonym--> Separate <--IsA-- Segment <--RelatedTo--> Episode 
Force <--RelatedTo--> Momentum <--Synonym--> Impulse <--Synonym--> Stimulus <--Synonym--> Influence 