The book is not very heavy. The table pushes up on the book. The book probably has a sticky cover. The table is composed of a stronger material than the book.
I gave my students this multiple choice question: A book placed on a table is observed to remain stationary. Which statement about the observation would be considered a fact rather than an opinion?

Only one answer is correct among these 4 choices:
- The book is not very heavy.
- The table pushes up on the book.
- The book probably has a sticky cover.
- The table is composed of a stronger material than the book.

Could you tell me which one is correct?

The table pushes up on the book.