Experimental Materials
Scissors, coins, white paper
Experimental procedure
1. Use scissors to cut a piece of paper the size of a coin on white paper.
2. Let the paper fall freely in the air.
3, let the coins fall freely in the air alone, the comparison found that the paper used for a long time, falling far.
4. Place the paper on top of the coin, let them fall freely from the air at the same time, and find that the paper and the coin land at the same time and fall at the same point.
Experimental principle
Since the weight of the paper sheet itself is small, it is relatively affected by the air resistance, so when the paper falls from the same height, the paper sheet is dropped and used for a long time. When the paper is placed on the coin and falls together, the coin quickly falls and the air below is quickly squeezed to the sides. The upper and lower sides of the coin form a pressure difference, and the upper atmospheric pressure presses the paper on the coin, so they land together.
The dental electric wax knife belongs to the field of medical tools, including a handle, a knife head connected with the handle, a power supply and a switch provided on the handle, and is characterized in that: the knife head has a hollow structure, and a wax storage part is provided in the knife head. The wax component includes a metal shell, a resistance wire wound on the outer wall of the metal shell and a wax block filled in the metal shell, the resistance wire is electrically connected to the power source, and a one-way air inlet valve is provided above the wax block, The one-way air inlet valve is fixed on the inner wall of the cutter head, the outer wall of the cutter head is provided with a soft button, the bottom of the metal shell is connected with a discharge pipe, and the discharge pipe penetrates the cutter head. The internal heating and storage of wax can conveniently adjust the state of wax droplets, so that the final wax extruded from the discharge tube is semi-solidified, which has good applicability, and there is no need to fetch wax back and forth, which greatly simplifies the clinical operation.
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