Final answer:
The yardstick test is a direct measurement of reaction time because it involves a simple experiment to determine how quickly you can react to a stimulus. By measuring the distance the ruler falls and using the known acceleration due to gravity, you can calculate your reaction time. It directly measures the time it takes for you to react to a stimulus.
Step-by-step explanation:
The yardstick test is a direct measurement of reaction time because it involves a simple experiment to determine how quickly you can react to a stimulus. In the experiment, a friend holds a ruler between your thumb and index finger, and drops it unexpectedly. Your task is to catch the ruler as quickly as possible. By measuring the distance the ruler falls, you can calculate your reaction time.
Reaction time is the time it takes for you to respond to a stimulus. In this experiment, the ruler dropping is the stimulus, and your catching of the ruler is the response. The faster you can catch the ruler, the quicker your reaction time. By measuring the distance the ruler falls and using the known acceleration due to gravity, you can calculate your reaction time.
The yardstick test is a direct measurement of reaction time because it directly measures the time it takes for you to react to a stimulus. It does not rely on any indirect or subjective measurements. Instead, it provides a clear and objective measurement of your reaction time.