In the experiment to study the effect of a net force on an object's motion, the two other measurements the students should take in each trial, alongside the net force applied, are mass and acceleration.
This is because:
- By knowing the mass of the object and the net force applied (using Newton's second law, \( F = ma \)), the students can calculate the acceleration of the object.
- Measuring both mass and acceleration will allow for a comprehensive analysis of how the net force influences the motion of the object.
Thus, the correct response is mass and acceleration.