Answer :
Final answer:
The chair will move to the left if a B. force greater than the maximum static frictional force (175 N) is applied to the left, according to Newton's third law of motion and the principles of static friction.
Explanation:
In order to move the chair to the left, a force greater than 175 N must be applied in the left direction, which is option B. To understand why, consider Newton's third law, which states that for every action, there's an equal and opposite reaction. That is why even when we exert backward force on the floor, not all of that force is transmitted to move the object; some of it accelerates the actor (in this case the professor).
Similarly, when applying a force to the chair to move it left, if the force applied is less than or equal to the maximum static frictional force (which here is 175 N), the chair won't move. Only when a force greater than the static frictional force is applied, will the chair start to move. This is because the static frictional force acts in the direction opposite to the applied force, trying to prevent the chair's movement.
In other words, the frictional force between the chair and floor attempts to resist any motion of the chair. Hence, to overcome this resistance and move the chair to the left, a force greater than 175 N must be applied to the left (option B).
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