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30 July, 09:45

Jerome places a bag of flour on a scale. The scale shows that the bag has a weight of 17 N. Which is the reaction force of the bag sitting on the scale?

A. The scale exerts a 17 N force up on the bag.

B. The scale exerts a 17 N force down on the counter.

C. Earth exerts a 17 N force down on the bag.

D. The bag exerts a 17 N force down on the scale.

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  1. 30 July, 11:32
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    A. The scale exerts a 17 N force up on the bag.

    If it didn't, then the vertical forces on the bag would be unbalanced,

    and the bag would be accelerating either up or down.
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