Final answer:
A watch with a second hand is more precise than a watch with only an hour hand because it can measure smaller increments of time, providing more accurate timekeeping.
Step-by-step explanation:
A watch with a second hand will always be considered more precise than a watch with just an hour hand. When we compare the two types of watches, one showcasing seconds alongside hours, and the other showing only hours, we understand that the inclusion of the second hand allows for more granular measurement of time. In essence, it gives us the ability to quantify time to a smaller increment; seconds rather than just hours, thus providing a higher resolution of the current time. This is an essential concept in both physics, which deals with measurements, and everyday life when we need to be punctual and accurate with our timekeeping. The reference to the sundial, an ancient timekeeping device, serves to contrast the evolution of time-measuring instruments from very simple and less precise to modern and more accurate devices like watches with second hands.