Biology, 26.06.2019 00:30, fattypickeltoefungus

When a book sits on a shelf, what force (if any) does the shelf exert on the book? a. friction b. a normal force c. an action force d. the weight of the book

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When a book sits on a shelf, what force (if any) does the shelf exert on the book? a. friction b. a...