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What are some small scientific experiments about toothpicks?

Toothpick is a common commodity. Besides picking teeth, it can also be used to do some interesting scientific experiments. Here are some scientific experiments about toothpicks:

1. floating and sinking experiment: put a toothpick in a glass of water and observe its floating and sinking situation. Then, sharpen one end of the toothpick and put it into the water again to observe its changes. This is because sharpened toothpicks are more susceptible to water resistance and easier to sink.

2. Electrostatic experiment: Rub the hair or cloth with a plastic toothpick, and then put the toothpick near some small pieces of paper or other light objects to see if it is adsorbed on the toothpick. This is because friction will generate static electricity, which will make toothpicks charged, thus attracting light objects.

3. Density experiment: insert a toothpick into a glass filled with water and observe the change of water level. Then, insert the toothpick into the glass filled with oil and observe the change of water level again. This is because toothpicks occupy a certain volume in water, but not in oil.

4. Lever experiment: put a toothpick on your finger, gently press one end of the toothpick with your finger and observe the change at the other end. This is because the toothpick can be used as a lever to change the position of the other end by applying force.

These experiments can help us better understand some basic physical principles and phenomena, and also cultivate our ability of observation and experiment.