Activity design
It rained for more than ten days in early summer, and the ground was full of water. One day I walked into the classroom from the outside, and the children said to me, "Teacher, how can your trouser legs get wet with an umbrella?" . In our interaction with children, we often hear and see such a question: "How do plants absorb water?" "Why do sponges suck so much water?" "I scraped my leg again." "My clothes are sweaty." ..... In fact, these are all capillary phenomena around us. In order to explore this phenomenon with children, the scientific activities of "Small Tube University" came into being.
moving target
1, let children intuitively feel the capillary phenomenon in life through game activities.
2. Cultivate children's cooperative inquiry ability, observation ability and hands-on operation ability through activities.
3. Develop children's observation and imagination.
Through observation, communication and discussion, we can perceive the constant changes of things around us and know that everything is changing.
Activities to be prepared
1, towels, sponges, cloth, crepe paper, gauze and other absorbent materials and some plastic pots.
2. Red, yellow, blue and green water, Chinese cabbage leaves, celery, thin tubes (straws for medical blood collection tubes or oral liquid), transparent tapes, magnifying glasses, etc.
3. Paper flowers made of white crepe paper and trees made of plastic.
4. Courseware and video of capillary phenomenon in life.
Activity process
First, give it a try:
1, absorbent paper:
(1) Fix one end of the corrugated paper (rectangle) on the thick paper board with adhesive tape, and draw an ink dot on the other end of the corrugated paper 1/4 with a black pen.
(2) Place the cardboard vertically so that one end of the corrugated paper is soaked in water. Guess what will happen to this piece of paper? The water climbed high along the paper and spread upward with color.
Question: Why does water climb high? Let's do another experiment.
2. Water that can climb high: Each person takes a capillary and puts it into four colors of water. What did you find? (colored water climbs up the capillary).
(Teacher's summary: The phenomenon that water will climb up and spread along capillaries is capillary phenomenon. )
Question: Why does water climb up the paper? The teacher guided the children to observe the paper with a magnifying glass. What did you find?
Paper has tiny cracks, and water will climb and spread along these cracks.
Second, play:
Guide children to use various materials to help water move and continue to explore capillary phenomenon.
1, Teacher: There is a lot of water here today, but it is too uncomfortable for them to live in a small plate now. They want to move to a big spacious basin. What should they do? They want to test you. Don't pour it. Use something beside the small basin to help the water flow.
Tell me: How do you help water move?
Encourage young children to tell how they did it.
Summary: These things can help water move, and they can absorb water.
3. Think about it: What else can absorb water?
Can plants absorb water? )
The teacher observed the changes of the experiment done the day before (putting the roots and stems of celery or cabbage into colored water) and guided the children to explain with what they had learned.
Knowledge points: Plants transmit water and nutrients through fiber tubes in roots and leaves.
Third, take a look.
1, capillary phenomenon video of children watching life
2, the capillary phenomenon courseware around us (the teacher captures the capillary phenomenon in children's lives).
Fourth, do it.
In this session, children will be divided into groups, and each group of children will do an activity. Finally, they will cooperate to dress up as mother tree.
1, the white flower becomes a colorful flower.
The children take a white flower and try to turn it into a colorful flower. The teacher guided the children to touch a small part of the flowers with pigment water and observed the phenomenon that the white flowers turned into colorful flowers.
Step 2 dye ...
Children take a cup of pigment water, put it on a large porcelain plate, and dye it with gauze and paper towels to guide children to observe the process of water discoloration in gauze and paper towels.
3. Color tree:
Wrap the beverage bottle with crepe paper (several layers), cut the crepe paper higher than the bottle mouth with scissors, twist it into a tree (stick the joint firmly with transparent tape), put it into a porcelain dish, pour colored water into the dish, and observe the change of water rising and spreading along the tree with a brush.
Step 4 dress up as a tree mother
Children will make colorful flowers and decorate them on trees.
Extended activity: find it.
What other capillary phenomena exist in our life (this activity can also be explored with parents as a family activity).