To determine which change in force would stop the box from moving, we need to consider the net force acting on it.
- If a force is pulling to the right and we need to stop the box from moving, we can either reduce that force or apply an equal and opposite force.
- If there is a force acting to the right, subtracting a force pulling to the left would not stop the box from moving to the right; it would actually reduce the opposing force but not stop the motion.
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Subtracting 8 N of force pulling to the left: This would further increase the net rightward force, making it more likely to move right.
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Subtracting 8 N of force pulling to the right: This reduces the rightward force, which may help to bring the system toward equilibrium if there’s also a leftward force present.
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Adding 6 N of force pulling to the right: This adds more force to the right and would increase motion to the right.
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Adding 6 N of force pulling to the left: This would create more force opposing the rightward movement, which could potentially stop it, depending on the existing forces.
From all the options, adding 6 N of force pulling to the left is the only action that would help counteract any existing force to the right effectively and could potentially stop the box from moving.
So, the correct answer is: adding 6 N of force pulling to the left.
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