2. The canoe has crossed Chung Shan Man: This poem is set in a mountain, and the ship is moving relative to the mountain.
Leaves fall like the spray of a waterfall: the leaves fall to the ground under the action of gravity.
4. And I watch the long river always rolling forward: the river flows to low-lying places under the action of gravity.
5. Qian Fan passed by the sunken ship: description of relative motion. Because his boat is not moving, the boat next to it is moving relative to itself.
6. How much sadness can you have, just like a river flowing eastward: in China, the east is lower than the west, and the river flows downwards under the action of gravity. . (Physics+Geography)
7. The moon rises on the sea, and the world ends * * * At this time: Because the moon is far from the earth, the moonlight shines in a wide range. . (Physics+Geography)
8. Reading with the sound of wind and rain, the sound is in the ear: 1, and the spread of sound will not interfere with each other; 2. Sound can spread around obstacles.
9. It snows in Tianshan Mountain in May, and there is no wind but cold. It shows that at high latitudes, the cold weather lasts for a long time because the sun receives less heat. (Physics+Geography)
10, grass withered eagle eye disease, light snow: grass yellow, animals can see the eagle in the sky more clearly because there is no camouflage of protective color. This is a phenomenon of light; Because there is no snow on the ground, the horse runs faster, which is a mechanical phenomenon.
1 1, until the war drums, which exploded from Yuyang, shook the whole earth and broke the tune of rainbow skirts and feather clothes: the previous sentence shows that the earth (solid) has stronger ability to spread sound than air.
12, I know from a distance that it is not snow, but it has a faint fragrance: it looks like snow (white), but by distinguishing the taste, I know the essence of matter, and the faint fragrance comes from the movement of molecules. (Physics+Chemistry)
13, even the sea level is in the spring tide, and the bright moon on the sea is born in the tide: the previous sentence means that due to the gravity of the earth, the water levels of rivers connecting the sea are at the same height as the sea level.
14, you have seen how the water of the Yellow River moves out of the sky and into the ocean, never to return: physical phenomena are the same as the sixth poem.
15, Hanshan Temple outside Gusu City, midnight bell to passenger ship: judge the object making sound according to the timbre of the sound.
16, you can draw a carved bow like a full moon, look northwest and shoot a Sirius: the full bow contains elastic potential energy.
17, Flying down the Three thousands of feet: Water falls from a height, including the transformation of gravitational potential energy and kinetic energy.
18, in August, the high wind roared, rolling my three hairs: the moving air (wind) has kinetic energy.
19, Chai Men smells dogs barking, and people go home in the snow at night: sound can transmit information, and people know that someone is back through dogs barking.
20. But after going up a flight of stairs, you can broaden your horizons by 300 miles: you can only see far if you climb high. (Physics+Geography)
Hehe, it took me more than an hour to recall these things, so I didn't classify the same phenomenon. I hope the landlord can be satisfied. I'm sure I can find more answers by rummaging through ancient poems.