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Product name: KX705 submarine
Item no: KX705
Size: submarine: 200*65*60mm tube length: 700mm 20ml syringe
Weight: about 100g
Material: plastic + hose + syringe + balloon + nut...
Color: blue
Battery: no
Packing: 200 PCS
Rules: 600 * 450 * 550 mm

Watercraft, also known as submarine or submarine ship, submarine is able to operate underwater vessels. The submarine is a recognized strategic weapon, which can be used to attack warships on the surface and submarines on the water, as well as important military targets on land. It can also carry out mining, reconnaissance and transport of personnel and important military materials when necessary. Submarines have a good stealth and surprise attack ability, in the water can be long, long lasting voyage. Submarines come in a variety of shapes and sizes, ranging from small civilian submersible detectors that are fully automated or operated by one or two people for several hours, to Russian typhoon-class nuclear submarines that can carry hundreds of people and dive continuously for three to six months. According to the volume can be divided into large, medium or small and underwater automatic equipment. In this section of experiments, let's explore the mystery of submarine sinking and floating.

Homemade submarines: interesting ups and downs

Moving target
1. Understand the ups and downs of objects, and classify objects that sink and float
2. Use a variety of methods to float items submerged in the water and sink items floating on the water, learn to record forms and be able to express the results of operations in complete language
3, can be patient, focus on the experiment, not afraid of failure, experience with ups and downs to solve the actual problems of life happy

Activities to prepare
1. Submarine material package and experimental birdbath.
2. One copy each of the record sheet and pen
The basic process
\"What do you think happens when a submarine is put in the water?\"
2. Why did it come up? Why did it sink? Explain the process of sinking and floating
3. Question: what do you still find floating on the water in your daily life? Those things are in the water?
3. The teacher shall show various items in the experiment, and the children shall perceive their characteristics by means of seeing, touching and weighing, etc., and discuss the method of floating the items in the water and sinking the items floating on the water.
(2) children discuss in groups and try to explore various methods (the teacher helps children solve problems encountered in the operation process)
(3) individual communication: encourage children to speak boldly and demonstrate their own methods
A way to float a heavy object
A method of sinking floating objects
Summary: by changing the shape, weight, or with the help of other objects, submerged objects can float up and floating objects can sink down.
4. Use ups and downs to solve practical problems in life
Situation \"the ball fell into the hole and could not be taken out. What should we do? \"
extension
Children go home and discuss with mom and dad: what practical problems can be solved by using ups and downs in daily life?