It seems like you're looking for examples of figures of speech or literary devices. Here’s how we can categorize the sentences you provided:
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“There is a metric ton of books in my backpack” is an example of hyperbole. This is an exaggerated statement not meant to be taken literally, emphasizing that the backpack is very heavy.
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“My backpack stubbornly refuses all attempts to lift it, even when I use both hands” is an example of personification. This assigns human-like qualities (stubbornness) to an inanimate object (the backpack).
If you have more sentences or need further clarification, feel free to share!