Wonderful Sports

1. Scientific principles and presentation content

Scientific principle: A circle is a mathematical term that refers to the trajectory of a moving point on a plane, centered at a certain point and a certain distance over a certain distance. It is called a circle or simply a circle. A moving circle is inscribed on a fixed circle for non sliding rolling, and the trajectory of a fixed point on the circumference of the moving circle is called an epitrochoid.

When a small circle intersects with a large circle and rolls along the large circle, if the diameter of the small circle is exactly equal to half of the diameter of the large circle, then the trajectory of any point on the edge of the small circle, namely the epitrochoid, will be a straight line passing through the center of the large circle.

Display content: This exhibition mainly introduces the relevant scientific knowledge and principles of circles and hypocycloids, allowing the audience to have a deeper understanding and knowledge of the characteristics of circles during the interactive experience.

2. Function description

The exhibition items consist of a disc, handwheel, electrified glass, etc. The audience rotates the handwheel to observe the movement trajectory of the gradually lit light spots. It can be seen that when the circular light circle composed of 8 light spots rolls along the inside of the large circle, the movement trajectory of each light spot is a straight line. After the glass is electrified and transparent, the internal structure of the exhibits can be observed.

3. Form of expression

Mechanical and Electrical Interaction

4. Operating instructions

Rotate the handwheel and observe the trajectory of the light spot movement.

5. Exhibition size (Shanghai Inertia standard finished product size, customizable)

Length x Width x Height (m)=1.00 x 1.00 x 1.45