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Product name: C501 balloon car

Item no: C501
Size: 180 * 10 * 80 mm
Weight: 40 g
Material: EVA+ plastic accessories + hardware accessories + balloons
Packing: 280 PCS
Rules: 600 * 500 * 450 mm

Scientific revelation:

Fireworks were invented as early as 800 or 900 years ago in the song dynasty, among which there is a \"flower\". When the gunpowder burns rapidly, the gas generated is ejected from the lower end of the cylinder at a great speed, and the cylinder itself rises upward. Modern rockets work in a similar way, using the recoil of fast-moving gases to give them tremendous speed. Now we use the balloon to release the strength to push the toy car, what will happen to the phenomenon and the result?

Experimental purpose:

1. What is recoil motion and its characteristics
2. Encourage children to love science by understanding the role of recoil.

Treasure of knowledge:

A phenomenon in which an object ejects a large amount of liquid, gas, or ejection at a high speed in a certain direction so that the object itself gains reverse velocity is called recoil motion.
Characteristics: (1) the interaction between objects suddenly occurs, short time, strong.
In the phenomenon of recoil, the system under the external force is generally not zero; If the internal force is far greater than the external force in recoil motion, the momentum conservation of the system in recoil motion can be considered.

In the problem of recoil motion, the velocity is sometimes encountered as the relative velocity between the interacting objects, which is the equation of momentum conservation in the column after the relative velocity is converted into a pair of velocities.

In the recoil movement, the motion of objects with variable mass is often encountered. For example, in the process of rocket movement, the mass of the rocket itself is decreasing with the consumption of fuel. At this time, the whole process of the interaction between the rocket itself and the rocket itself must be studied.

Scientific production:

1. Open the material package and find the necessary equipment for the experiment.
2. Install the car as shown in the picture
3. Fill the balloon with air and install it on the frame to start the experiment

Knowledge development:

Through the analysis of examples, it is clear that recoil has both advantages and disadvantages. In addition to the examples of recoil and its application in daily life described above, can students also cite recoil applications? The jets and rockets we lift, do they use anything other than recoil? What is the difference between ancient rockets and modern rockets? Students can take these questions, in life and books to observe, more understanding.
The movement of recoil movement and prevent:, application: irrigation sprinkler, counterattack turbine, jet aircraft, rockets and so on are recoil important role. , prevent: when shooting with a gun, the bullet goes forward, the body recoils backward, the recoil of the gun will affect the accuracy of shooting, so when shooting with a rifle, the body of the gun to the shoulder to reduce the impact of recoil.
Did you know that if a system receives no external force or the vector sum of the external forces is zero, the total momentum of the system remains the same? This is called the law of conservation of momentum. Momentum conservation law is one of the most important and universal conservation laws in nature. It is an experimental law, and can be derived from Newton's third law and the momentum theorem.