Which example below provides a complete scientific description of an object in motion?
A The marble changed position quickly
B The car traveled north
C The marble moved 30 cm north in 6 seconds
D The ball rolled 20 cm in 5 seconds
The example that provides a complete scientific description of an object in motion is C: "The marble moved 30 cm north in 6 seconds."
To determine if a description is complete, we need to consider a few key elements: the distance covered, the direction of motion, and the time it took to cover that distance.
In option A, "The marble changed position quickly," there is no specific distance mentioned, nor the direction or time taken, making it incomplete.
Option B, "The car traveled north," specifies the direction of motion, but does not mention the distance or time, so it is also incomplete.
Option C, "The marble moved 30 cm north in 6 seconds," provides both the distance (30 cm), the direction (north), and the time taken (6 seconds). This description includes all the necessary information to present a complete scientific explanation of the object in motion.
Option D, "The ball rolled 20 cm in 5 seconds," includes the distance covered and the time taken but lacks information about the direction of motion. So, it is incomplete.
Therefore, option C is the correct answer as it provides a complete scientific description of an object in motion.