Book 28, Question 102 · Video
How do track meets start races fairly?
Modern races use an electronic starter. The sound of the starting signal plays through small speakers behind each runner's blocks, so everyone hears it at the same time. Sensors in the blocks measure when runners push. If a runner pushes off less than a tenth of a second after the signal, it is judged too fast for a human reaction and counts as a false start.
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What Crafty Clover says in this video
Intro
Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. How do track meets start races fairly?
The Big Idea
Bang! The race begins! But how do officials make sure the start is fair? Electronics help!
Speakers
Step one: Speakers. Modern races use an electronic starter. The starting sound plays through small speakers behind each runner's blocks, so everyone hears it at the same time.
Sensors
Step two: Sensors. Sensors in the blocks measure exactly when runners push off. No one can hide a sneaky start.
False Starts
Step three: False Starts. If a runner pushes off less than a tenth of a second after the signal, it's judged too fast for a human reaction. It counts as a false start.
A Closer Look
Let's take a closer look! Equal sound. Hold feet. Time pushes. Too early.
Quick Facts
Quick facts! A person's quickest reaction to a sound is about 0.1 to 0.2 seconds. Everyone hears together. Blocks have sensors. Too fast is false.
Think Like a Scientist
Now, think like a scientist! With a friend and a grown-up, stand in a clear space. One person claps at a surprise moment. The other steps when they hear it. Try guessing instead. Why don't runners just guess?
Outro
Fair starts use speakers behind every runner so all hear the signal at once, and sensors in the blocks time each push. Pushing off less than a tenth of a second after the signal is too fast for a human, so it's a false start. Science is amazing! Keep wondering and keep exploring! Share what you learned with someone at home, and see what they think! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!