Final answer:
The terms 'better or worse' and 'smooth or clunky' are subjective descriptions of movement's quality and point to experimental variability in measurement as seen in Jaiqua and Harold's experiment with ramp steepness.
Step-by-step explanation:
If the report uses terms like better or worse, smooth or clunky, these are describing the quality of the movement and are therefore subjective measures. Such descriptive terms do not provide a quantitative or reliably reproducible measure of motion; rather, they reflect an individual's perception or opinion about the motion's characteristics.
Jaiqua and Harold are examining how the steepness of a ramp affects a ball's speed. The differences in outcome based on who operates the stopwatch or rolls the ball indicate a form of experimental variability, which is the variability due to differences in the way each person performs his or her role in the experiment. This can include variations in reaction time when starting or stopping the stopwatch or slight differences in the way the ball is released down the ramp.
To accurately describe motion represented by a graph, it is essential to refer to specific, measurable aspects such as the change in velocity, change in momentum, rate of change of velocity, or rate of change of momentum. These terms are quantifiable and provide a clearer understanding of the motion's nature.