Two goals:

1 Explore the changes of table tennis elasticity under different environmental conditions.

Know the relationship between force and elasticity.

Interested in finding and solving problems.

I am interested in table tennis, a table tennis star.

Three preparations:

1 There is a table tennis player, 1 There is a record player.

Auxiliary materials: cotton, wooden board, cardboard racket, etc.

The total number of table tennis champions won by China in Doha Asian Games and the pictures and materials of table tennis stars.

Four processes:

1 greetings from teachers and students.

Lecture-Doha Asian Games and Table Tennis

Show pictures and information of table tennis stars. Teacher: Who is this? What do they do? The Doha Asian Games is being held. Do you know how many gold medals they won in table tennis at the Asian Games?

Summary of teachers and children: omitted.

3 Explore the relationship between table tennis elasticity and strength.

(1) Teacher: All the children have a ping-pong ball in their hands. Please play it. What's new? Tell teachers and children.

(2) children's operation, teachers participate in children's activities.

(3) Teachers inspire children to sum up: When playing table tennis, table tennis with great strength jumps high, while table tennis with small strength jumps to the bottom.

Show the cotton, cardboard and wooden board, let the children guess on which material the table tennis jumps high, and show the record form, and ask the children to record their guess results in the form. You can use numbers or marks when recording. )

material

cotton

paperboard

board

result

Let children try three kinds of materials with the same strength and record which material table tennis jumps high on.

material

cotton

paperboard

board

result

The teacher guides the children to sum up from the comparison of guessing and operation: the elasticity of table tennis will change, and when it comes to hard materials, it will jump very high. When it comes to soft materials, it has little elasticity and low jump. The elasticity of table tennis is related to the force. Jumping hard is high, jumping hard is low.

7 small contest-who is the first?

Teacher: Look for your good friend, little friend. Let's pair up and see who plays table tennis more. Guide children to explore the relationship between the height and frequency of table tennis jumping during the competition.