Produce is related to Grocery. you are likely to find Grape in/at/on Grocery. you are likely to find Grape in/at/on Shop. you would Shop because Eat. 
Physics is related to Chemistry. 
Produce <--RelatedTo--> Grocery <--AtLocation-- Grape --AtLocation--> Shop --MotivatedByGoal--> Eat 
Physics <--RelatedTo--> Chemistry 