Physics

Mark's physics book is on the desk. Mark pushes horizontally (from the side) on the book, but the book does not move.
Which force diagram represents the force on the physics book? You may neglect air resistance.

a) A box with two arrows, one pointing up and one pointing down. They are equal.
b) A box with four arrows: pointing up, down, left, and right. They are all equal.
c) A box with four arrows: pointing up, down, left, and right. The one pointing right is very long.
d) A box with two arrows, one pointing up and one pointing down. The one pointing down is very long.

I am unsure of this answer because the fact that the book does not move is throwing me off... I don't know which one this would be:/ (c?)

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  1. not moving means the force of pushing is equal to the static force of friction.
    None of the answers is correct.
    You have four arrows, left, right and they are equal. Then considering gravity, one going down, and one up from the table, they are equal.

  2. Okay, then it should be b) - there are 4 arrows and they're all equal:)
    Thank you so much!

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  3. No, they are not equal. the left = right, and the up=down.

    left does not equal up, nor down. think about it.

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