If the resultant(net) force increases, the ___________________Group of answer choicesacceleration increasesproportionalmass increasesacceleration decreases

To solve the problem, we can refer to Newton's Second Law of Motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration ( $F = m \cdot a$ ).

Analyzing the Options:

1. Acceleration Increases: If the net force increases while the mass remains constant, the acceleration will indeed increase. This is consistent with the equation $a = \frac{F}{m}$.

2. Proportional: This is a vague option without context; however, it can be inferred that force and acceleration are proportional when mass is constant.

3. Mass Increases: The mass of an object does not change with the net force applied to it.

4. Acceleration Decreases: This is incorrect, as an increase in force would not cause a decrease in acceleration if mass stays constant.

Final Answer

The correct choice is acceleration increases.