Reaction Time
Reaction Time is how fast you respond to something you see, hear, or feel, like catching a ruler someone drops.
A flat pan sits on the stove, and a pot lid rests beside it. When you hear the lid start to rattle, you reach out to grab it. The gap between the rattle and your hand moving is your reaction time. A shorter gap means your brain sent the signal to your hand faster.
Explaining reaction time by grade level
Have a friend hold a ruler up high. When they let go, you try to grab it. The less the ruler falls, the faster you caught it. Some people grab it near the top. Some grab it near the bottom. Your brain has to tell your hand to move, and that takes a small bit of time.
Projects that explore reaction time
Reaction time measures how fast you respond to something you see. When someone drops a ruler, signals travel from your eyes to your brain to your hand. A conversion chart turns the distance the ruler falls into reaction time in milliseconds. Comparing scores across different people reveals whether age or practice changes reaction speed.
Reaction time can vary between individuals and groups. In a ruler-drop test, you release a ruler between a participant's open thumb and index finger without warning. The participant catches it as fast as possible, and a shorter distance means a faster response. Testing 20 boys and 20 girls of the same age and comparing the average distances shows whether one group responds more quickly.