Physics experiment in the new Beijing Science and Technology Museum. Simple. Don't make long speeches.

1, Hercules "paper" hand (paper holding water):

Steps: first, fill the cup with water to avoid overflowing; Then cover the paper on the cup and turn the paper and the cup upside down; At this time, the water will not flow out and the paper will not be soaked.

Principle: Fill the cup with water. After the paper is covered, there is no air in the cup. On the other hand, the external atmosphere will generate buoyancy for the cup and water, so that the water will not flow out.

2. The air is playing tricks (the balloon is not big):

Steps: prepare a balloon and an empty beverage bottle, and stuff the balloon into the bottle; Enlarge the blowing port of the balloon and buckle it on the bottle mouth; Blow hard at the bottle mouth, although I did my best, but I was flushed until I saw the result; The balloon is only a little bigger, but it can't be inflated.

Principle: There is air in the bottle. When the blowing port of the balloon is locked on the bottle mouth, the air is sealed in the bottle. When blowing, the volume of air in the bottle is compressed and reduced. Therefore, the pressure in the bottle increases, and so does the pressure on the balloon. When the pressure in the bottle is equivalent to the pressure generated by blowing the balloon, the balloon will never blow up.

3. Book tug-of-war contest (two books are inseparable):

Steps: put the notebook on the table, the binding faces are opposite, and leave the width of one notebook in the middle (in order not to destroy the book, you can do the experiment with two notebooks); Overlap each page of the notebook in turn; Until all the papers overlap, at this time we gently press them together; Pick up the notebook with both hands and try to separate it.

Principle: It's because of friction. When objects touch each other and have a tendency to move relative to each other, friction will be generated. When the tension is greater than the friction or the contact surface is smooth, two objects can be separated. There will be friction when two pieces of paper are stacked together, but it is not enough for us to notice. With the increase of the number of papers, the friction between the papers is greater than our pulling force, so we can't separate the two notebooks.

Extended data:

Introduction of exhibits in Beijing Science and Technology Museum

There are also many distinctive exhibits in the public space of the new museum, which are distributed on the first to fourth floors of the exhibition hall of the new museum. Unique exhibits include:

Ball array-located on the ceiling of the first floor of the West Hall, 805 balls with a diameter of 26 cm are suspended by steel wires, forming an array with a length of 18 m and a width of 12 m; Under the control of the computer, the motor controls the ball to move up and down in a straight line in the air to form different geometric patterns.

Life Spiral-Located in the south hall on the first floor, the huge double spiral sculpture (47 meters high) composed of human body shows that DNA is the foundation of all life on earth and the beauty of its shape.

Mechanical melody-located on the first floor of the popular science corridor, it is a collection of various gears, connecting rods, cylinders, pistons, cams, apertures, sliders, wheels, swinging structures, etc. Complex mechanical devices and their linkage and operation processes are used to express the beauty of machinery and its metal materials.

Molecular Motion Wall-Located in the south hall on the first floor, more than 20 hemispherical "molecular sliders" move freely and collide with each other, showing the beauty of microscopic particle motion similar to Brownian motion and reproducing the process of free movement and collision between molecules.

Dynamic deformation wall-located on the second floor of the North Ring Corridor. The electromagnetic valve controlled by computer drives hundreds of cylinder rods to expand and contract, so that the wall surface regularly fluctuates to form specific patterns or characters, and the audience leaning against the wall surface can be pushed out.

Life course-located in the underground passage. The 68-meter-long artistic glass relief mural shows the birth and evolution of life on the earth from west to east in turn, including the idea of life evolution and the relationship between life evolution and the environment.

The wheel of time-located in the north corridor on the third floor. The transparent dial reveals its complicated and exquisite mechanical structure and parts, and through the structural modeling and mechanical movement of the watch, it shows the complicated and exquisite mechanical structure and operation process of the watch.