In an experiment, a student observes an object as it travels in one direction along a straight path. Which TWO of the following measurements does the student need to calculate the average speed of the object?
The distance traveled and the elapsed time are needed to calculate the average speed of the object.
Average speed is defined as the total distance traveled divided by the total time taken for that travel. Therefore, to determine the average speed, both the distance and the time must be recorded during the object's motion.
The mass of the object does not play a role in the calculation of average speed. Average speed is a measure of distance over time and is independent of an object's mass. While mass can affect other aspects of motion, such as acceleration under force, it is not necessary for determining average speed.
This measurement is crucial for calculating average speed because average speed is defined as the total distance covered during a specific time interval. Without knowing the distance, one cannot perform the mathematical operation needed to find average speed.
Elapsed time is equally important for calculating average speed since it provides the denominator in the average speed formula (speed = distance/time). Without this measurement, the average speed cannot be determined, as the duration of the object's travel is essential for the calculation.
The environmental temperature is irrelevant to the calculation of average speed. While temperature may affect the motion of objects (for instance, through changes in air density), it does not contribute to the necessary measurements of distance and time required to compute average speed.
To calculate the average speed of an object traveling in a straight line, the student must measure both the distance traveled and the elapsed time. These two parameters are essential for applying the average speed formula effectively. Other factors, such as mass or temperature, do not contribute to this specific calculation and therefore are not needed.
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