Aperson is pushing a box across a table. the measured forces on the box are 10n, 14n, 7n, 10n. which force is represented by 7n? force of friction normal force force of gravity push force

first option, force of friction.

Explanation:

1) The box is moving over the surface of a table, so you conclude that there is no vertical motion, which means vertical acceleration and net forces equal zero.

Being the vertical forces 0, the two 10 N forces correspond to the weight and the normal forces.

2) That leaves 14 N and 7 N. Since the box is moving in virtue of the push, the push force is 14 N and the other force (7N) is the friction, which opposes the mottion but yet there is a net horizontal force: 14 N  - 7 N = 7 N, which keeps the object accelerating.

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