1. Mechanics: ① Force can change the shape of an object: pinch it hard to flatten it. ② Under the same conditions, the rolling friction is less than the sliding friction (or static friction): construct an inclined plane, let the box rest and slide down, and compare the distance. ③Liquid pressure: the first option: seal the top of the can, lower it into the water, and compare the deformation of the can at different positions; the second option: drill a few holes on the side to see how far the water drains; ; the third option: cut the box into a cylindrical shape, drill three round holes in the side, seal the sides and bottom with rubber film, then fill it with water. this can prove that hydraulic pressure is related to depth, and second, it can show that hydraulic pressure is in all directions.
2. Thermal science: ① Put ice (or snow becausebonique) into the can and stir it with chopsticks. You will find frost at the bottom of the can. ② Fill the can with water, close the top with a rubber cap (be careful not to tighten it too tightly), heat it and the rubber cap can be rinsed to demonstrate the conversion of internal energy into mechanical energy .
3. Acoustic phenomenon: It can prove that sound is produced by the vibration of an object, or by a change in pitch, etc.
4. Light phenomenon: Make the background... 1. Mechanics: ① Force can change the shape of an object: pinch it hard to make it flat. ② Under the same conditions, the rolling friction is less than the sliding friction (or static friction): construct an inclined plane, let the box rest and slide down, and compare the distance. ③Liquid pressure: the first option: seal the top of the can, push it into the water, and compare the deformation of the cane at different positions; the second option: drill a few holes on the side to see how far the water drains; ; the third option: cut the box into a cylindrical shape, drill three round holes in the side, seal the sides and bottom with rubber film, then fill it with water. this can prove that hydraulic pressure is related to depth, and second, it can show that hydraulic pressure is in all directions.
2. Thermal science: ① Put ice (or dry ice) into the can and stir it with chopsticks. You will find frost at the bottom of the can. ② Fill the can with water, close the top with a rubber cap (be careful not to tighten it too tightly), heat it and the rubber cap can be rinsed to demonstrate the conversion of internal energy into mechanical energy .
3. Acoustic phenomenon: it can prove that sound is produced by the vibration of an object, or by achange in height, etc.
4. Light phenomenon: Drill holes at the bottom, seal the back with translucent paper, and do small hole imaging.
That's all I thought of.
Which temperature is higher in empty cans: red, black or green?
Hot water in cans is not toxic.
The main ingredients of cans are aluminum alloy (which is lighter, like cans used for regular beer and cola) and tinplate cans (which are heavier, like cans used for Wangzai milk)), then there will be a layer of inert material coating on the surface of the can which is in contact with food, which can prevent the contents from chemically reacting with the can or metal elements of the can from dissolving and migrating into the food. /p>
Should The black can has a high temperature.
The color of an opaque object is thecolor of the light it reflects (only the mirror is colorless, but it can reflect any colored light, and it is a specular reflection). Almost everyone was absorbed by it. The opaque black body can absorb all colored light and does not reflect any colored light. At this point, it will absorb more heat, so the temperature of the black box is relatively high.