bob is pushing straight down on the box, which is in the direction that the force of gravity is, so the force downwards is equal to 12+mg.
Since there is no acceleration in the up/down direction, Fn=Fapplied=Fg
A 5 kg box is sitting on a table. Bob's hand is pushing down on the box with a 12 N force. Find the normal force on the box. (draw this)
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