Pulling it back and forth, the button spins faster and faster, making a "whooshing" sound.
The children exclaimed how amazing it was.
That's right, it's really amazing; even small folk gadgets contain great wisdom.
The principle behind the "spinning button" toy isn't particularly sophisticated; it simply creates a super spiral structure that can store a considerable amount of energy.
When the rope is pulled, the potential energy in the rope is released, and the button rotates due to the torque.
With just a little effort, a button can rotate at an unimaginable speed.
Centrifuges, commonly used in biomedicine, operate on this principle.
Jian Zhizhen spun around for a while, then casually gave the button to another child, who immediately picked it up and started playing with it.
She picked up the tool she had just made and explained to the children, "Making fire by simply rubbing sticks together is tiring; you can't start a fire if you don't spin it fast enough. But we can use the principle of turning a button, replacing the button with a combination tool made of stone and wood..."
Jian Zhizhen aimed the pointed end of the wood at the haystack, pulled the rope, the rope moved the stone, the stone moved the wood, and the wood immediately began to spin rapidly.
Soon, wisps of smoke rose from the grass and trees, which then burst into flames.
The children were also clamoring to try it out.
So Jian Zhizhen gave them the tools, and they lined up to play with them.
Pulling the rope quickly generates heat through friction, which is indeed much simpler than starting a fire by rubbing sticks together with your hands!
Everyone brought over the fuel for the fire and put it together, and thick smoke billowed up.
In the distance, the police looked up and saw thick smoke, and immediately headed in that direction to rescue them.
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