Categorize the following examples as either an example of a physical object or a concept:
Friendship, Water, Apple
Friendship: Concept
Water: Physical Object
Apple: Physical Object
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Categorize the following examples as either an example of a physical object or a concept:

### Response:
Friendship: Concept
Water: Physical Object
Apple: Physical Object