Final answer:
In the sentence provided, 'dip' is the object of the preposition 'with.'
Step-by-step explanation:
In the sentence "I eat my chips with French onion dip," the object of the preposition is dip. A preposition is a word that shows the relationship between its object and another word in the sentence. The preposition in this sentence is 'with', and the word that follows it, which is the object of the preposition, is 'dip'. Therefore, 'dip' is what is being used with the chips, and it is the object of the preposition 'with.'