To determine which change in force would stop the box from moving, we need to analyze the forces acting on it.
The left arrow (14 N) represents a force of 14 N to the left, and the right arrow (8 N) represents a force of 8 N to the right.
The net force acting on the box can be calculated as follows:
Net force = Force to the left - Force to the right Net force = 14 N (left) - 8 N (right) = 6 N (left)
This means there is a net force of 6 N acting to the left on the box, causing it to move left.
To stop the box from moving, we need to apply a force that counteracts this net leftward force of 6 N. We have the following options:
- Adding 6 N of force pulling to the left: This would increase the leftward force, so it wouldn't stop the box.
- Subtracting 8 N of force pulling to the right: This would reduce the rightward force but still leave a net force to the left. (Net force would still be 6 N to the left initially).
- Adding 6 N of force pulling to the right: This would provide an additional rightward force, resulting in a net force of 6 N to the right (8 N - 6 N = 0 N net force, which would stop the box).
- Subtracting 8 N of force pulling to the left: This would reduce the leftward force, making it even more difficult to stop the box, leading to an even greater net force.
Therefore, the correct answer is: adding 6 N of force pulling to the right.