Hello everyone, I am Mr. Xing. Now I will show you our company's new series of science popularization and enlightenment products. We have three models for different scenarios. The first is a display cabinet sales. It is used in large stationery wholesale stores in supermarkets. The second is hook display sales. It is used in small shops, such as the small convenience stores at the school gate and small stationery stores. This sales model is more space-saving. The third is a gift box, which is more suitable for giving as a set or a complete course. Our products are equipped with a series of teaching content such as PPT teaching plans and videos.

16 products are packed in gift boxes: models include: C309 Magnetic Sailboat, KX404 Creative Little Table Lamp, KX705 Simulation Submarine, C637 Electric Glider, C108 Gravity Car, C635 Exploration Steamship, KX1914 Hydraulic Robot Arm, KX1340 Doodle Robot, KX1908 Space Triquetrum, KX1907 Snail Fan, KX904 Smart Board, C633 Dinosaur Racing Car, KX1912 Catapult, KX414 Hand Crank Generator, C631 Off-Road Car, KX311 Telescope.

Hydraulic robotic arms are examples of the Pascal principle. The Pascal crack-pot experiment proved the existence of liquid pressure. According to the Pascal's law, when a certain pressure is applied to a piston in a hydraulic system, the same pressure increase will be generated on another piston. Hydraulic robotic arms control the sliding of the second syringe by pushing and pulling the first syringe, and then control the opening and closing of the grasping device through a set of mechanical structures.

Catapult is a large-scale human-powered projectile weapon that uses the principle of lever to throw stones. Its appearance is a sign of technological progress and the needs of war. The Chinese chess piece "Pao" in the black side is a catapult, and the character "Pao" with the fire radical in ancient texts often refers to the torture of fire. It was first used in the Spring and Autumn period, and after the Sui and Tang dynasties, it became an important weapon for attacking and defending the city. However, the Song Dynasty had further development compared to the Sui and Tang dynasties, not only for attacking and defending the city, but also for field battles. The terms "pushing stones" and "flying stones" in ancient books refer to the catapult.

The model of the running laws between the sun, the earth, and the moon is the Terrestrial Sphere. The Earth-Moon-Sun Motion Demonstration Model is a simple three-sphere model toy that can vividly depict the intuitive teaching model of the relative motion between the earth, the moon, and the sun. Children can let the model's earth, moon, and sun rotate according to the real running laws, which is very interesting!

The main components of an electric fan are: the power supply, the motor, and the blades. The working principle is: the circuit is connected, and the electricity provided by the battery is transferred to the motor, which then converts it into kinetic energy. When the motor starts working, it drives the blades to rotate, accelerating the flow of air around it, thus creating a breeze.

By utilizing the principle of eccentric vibration. The battery provides kinetic energy to the power device, driving the crankshaft to rotate at high speed. When the crankshaft is rotating, it continuously makes the bottom plate move in the opposite direction, thus causing the power device and the bottom plate to perform arc-shaped vibration at a high frequency. In simple terms, it is the principle of converting electrical energy into mechanical energy.

The Wisdom Board is an ancient traditional Chinese intellectual toy, as the name suggests, it is composed of seven boards. The Wisdom Board is an invention of the ancient Chinese laboring people, and its history can be traced back to at least the first century BC. It was basically standardized in the Ming Dynasty. It was widely spread among the people of the Ming and Qing dynasties. The accessories are drawn on the creative pattern of the board.

Archimedes' Principle, also known as the law of buoyancy, states that any object immersed in a fluid experiences a force equal to the weight of the fluid displaced by the object. The formula for buoyant force is: F_buoyant = G_displaced.

The generator utilizes the principle of four-stage gear speed-increasing to convert the slow hand-cranking into high-speed rotation of the generator for electricity generation. By observing the generator, one can intuitively learn about the principles of gear speed-increasing or speed-decreasing transmission and their processes. It is understood that a large gear driving a small gear is a speed-increasing transmission, whereas a small gear driving a large gear is a speed-decreasing transmission. Understanding why a hand-crank generator can generate electricity. Understanding what electromagnetic induction is.

A small table lamp is a stand lamp that can be placed on a flat stand. It is composed of a lamp base, a battery box, a switch, light bulbs, and wires, etc. Its function is to concentrate the light in a small area, which is convenient for work and study.

The convex lens in front of the telescope is called the object lens, and the concave lens at the back is called the eyepiece.
The objective lens gathers the light from distant objects and forms an inverted and reduced image behind it, essentially bringing the distant objects closer to the imaging location. Moreover, the inverted image of the object happens to fall at the focal point of the eyepiece, so when looking through the eyepiece, it appears as if one is viewing an object with a magnifying glass, allowing one to see a magnified and virtual image many times larger than the actual object.

The battery of the electric hang glider provides electricity to the motor, which converts the electricity into mechanical energy. The propeller of the electric hang glider rotates to apply a backward force to the air, and the air will produce a forward reaction force on the propeller, thus propelling the electric hang glider forward.

Electric propeller ships have blades installed around the periphery of the rotor, forming a rotatable propeller. These are mounted on the sides of the ship or at the stern. An electric motor drives the propeller, causing the propeller to rotate. The blades on the propeller push the water backward, generating a force. The reaction force of the water propels the ship, enabling it to move forward.

The battery for the dinosaur car provides electricity to the motor, which converts the electricity into mechanical energy. The propeller on the dinosaur car applies a backward force to the air, and the air exerts a forward reaction force on the propeller, thus propelling the dinosaur car forward.

Gear belt four-wheel drive cars are powered by batteries to provide electricity, allowing electric motors to generate power. Electric motors are devices that can convert electrical energy into mechanical energy. The rotation of the motor drives the axle of the rear wheels to rotate, and the front wheels will rotate through the connection of the belt, thus completing the four-wheel drive car.

The sailing ship uses the principle of 'like charges repel, opposite charges attract'. At the rear of the sailing ship, a magnet is placed, and the magnet on the wooden pole has the same polarity as the magnet at the rear of the sailing ship. This uses 'repulsion' to allow the sailing ship to slide forward. The sail, driven by the wind, helps the sailing ship to move faster forward.
The gravity car uses the law of conservation of mechanical energy. By gravity, the gravity pendulum on the rope falls to generate potential energy. During the motion of the gravity pendulum, it converts potential energy into kinetic energy. With the help of a fixed pulley and the rope, the direction of kinetic energy is changed, pushing the wheels of the car to rotate, making the car move.