Maybe a curve reaches the end faster than a straight line?
Can you cast photoelectric magic at the touch of a fingertip?
A cone rolls up "automatically"?
At the Zijingang Campus of Zhejiang University
In the physical demonstration lab
There are wonderful phenomena that were "never expected".
The 14th "ZJU Campus Experience Officer"
In the Physics Experiment Teaching Center
Deputy Director Zheng Yuan and other subject guides lead
Let's walk into this amazing laboratory
Explore the disciplines behind classical physics
Fundamentals of the mysteries
Edutainment and experience the mysteries of physics
"Sometimes 'taking a detour' is faster than 'walking a straight line' to reach the end!" In the Metrothermal Acoustics Hall, simple experiments continue to "subvert" the common sense of the experience officers:
The cone trajectory seems to move upward, but it hides the principle that the rigid body center of gravity moves downward; the curve "surpasses" the straight line and becomes the "fastest descent line" of the falling track of the small ball, reaching the bottom as soon as possible...... Everything seems unpredictable, but it makes sense.
Walking into the optical hall, the eyes of the experience officers were focused on the magical glow ball. The glow of the enchanting glow dances in the glass dome, and when you touch the dome, the beams gather on your fingertips, and the fingertips move like a dragon galloping, as if by magic.
This typical experiment vividly demonstrates the ionization luminescence of rarefied gases by a high-voltage electric field. "The contact of the human body creates a large potential difference between the center of the ball and the hand, thus creating a bright path between the ionized rarefied noble gases. Sodium lamps, street lamps, xenon car lamps, and mercury lamps in daily life also emit a unique light in a similar way. Assistant experimenter Zhang Li introduced.
It is with light that we begin to perceive the colors of all things and enter the colorful physical world. From the light path of the concave and convex lens, the colorful spectrum under the three primary colors, to the windmill driven by the photothermal effect, and the "abyss" that seems to be real and illusory, the experience officers experienced the real "bizarre" world in the optical hall.
What kind of tricks can a hand-held bicycle wheel play in the mechanics hall? The experience officers sat on stools one after another, holding the spindle in both hands. After the external force is applied, the vertical wheel quickly tilts to one side and pulls the stool to rotate to one side through the transmission of angular momentum. "This experiment on the conservation of angular momentum takes advantage of the characteristics of Zhukovsky's stool to show the precession effect of the gyroscope more intuitively. Zheng Yuan introduced.
This law of conservation of angular momentum is vividly applied in the attitude adjustment of spacecraft: the gyroscope rotating at high speed inside the space station is used as the support point, and the gyroscope angular momentum can be rotated to obtain the reaction moment to change the attitude of the space station.
In the electromagnetism hall, the experience officers not only experienced the electrostatic experiment, "getting" Einstein's "same" hairstyle, but also experienced the electromagnetic experiment of "alternating light and dark". A change in the induced electromagnetic field causes an induced current to be generated in the conductor, and the metal coils with the bulbs are brought close to each other to emit light.
Through hands-on practice, the experience officers built the circuit by themselves, and realized the measurement of large currents with a small-range ammeter through parallel resistor shunting and other operations, and applied the current calculation formula in the book to the actual circuit operation.
Wang Weiyu, a 2021 undergraduate student of the Faculty of Arts, said, "The long-forgotten knowledge of physics once again attracted me, and made me believe that liberal arts students should also experience more physical and chemical experiments and apply theories in practice. ”
Spring breeze and rain, deepen the edification of disciplines
Located in the East 4 Teaching Building of the Zijingang Campus, this 280-square-meter physics laboratory always awakens students' love and exploration of science. Since it was officially opened to the public at the beginning of 2021, the Physics Demonstration Laboratory has successively become the National Science Education Base of the China Association for Science and Technology and the Chinese Physical Society, the National Training and Practice Base for Youth Science and Technology Educators, and the Youth Science Education Base of the Zhejiang Physical Society.
"We have more than 200 demonstrators here. In addition to manufacturer purchase and cooperative research and development, there are many achievements of co-creation by teachers and students and transformation of discipline competitions. Under the leadership of Zheng Yuan, the experience officers saw a variety of experimental instruments independently designed by the students: cyclone balls, chaotic circuit demonstrators, Hauni characteristics demonstrators, whistle devices, transducer ultrasonic suspension and control......
For teachers, this is to continuously guide students to perceive the basic theories behind cutting-edge science and technology in practice, stimulate the ability and potential to explore higher-order knowledge, and for students, it is to continuously consolidate the foundation of the subject, improve their comprehensive ability, and establish the interest and ambition to become top-notch physics talents who will lead the future. "We encourage students to continuously improve their understanding of physical principles in practice. By showcasing their original designs, they can further stimulate their passion for exploring physics. Zheng Yuan said.
"Through this course, I have seen the breadth of physics knowledge, which is not only the foundation of cutting-edge technology, but also the bits and pieces of our lives. In the future, I want to be not only a learner of scientific knowledge, but also a disseminator of science. Xia Ziyun, a 2021 student from the School of Physics, said.
"Unthinkable" things and things can be unveiled in the physical world. As a science that studies the basic laws of nature, physics reveals the laws of the occurrence and development of things, and it is also the hope of civilization and progress. It is thanks to the discipline of physics that many fields of applied science have been able to develop rapidly "on the shoulders of giants".
In the Physics Demonstration Lab, we read the codes of nature through exquisitely designed experiments and deeply understand the charm of physics - to see things as they are, and then to firmly love all that is wide.
Source | Zhejiang University