Teaching aid for demonstrating arc length between two equally latitudinal points of spherical surface

Abstract

The invention discloses a teaching aid for demonstrating the arc length between two equally latitudinal points of a spherical surface. The teaching aid comprises a supporting structure, a connecting mechanism and a measuring mechanism. The measuring mechanism comprises supporting warps, supporting wefts and an upper supporting seat, wherein the supporting warps and the supporting wefts are uniformly distributed. The supporting wefts are fixedly arranged on the upper hemisphere of the supporting warps. A second supporting rod is fixedly arranged on the connecting mechanism. The other end of the second supporting rod is connected with a third supporting rod. The end part of the third supporting rod is connected with a fourth supporting rod through a connecting rod. The connecting rod is hinged to the third supporting rod. The other end of the fourth supporting rod is fixedly provided with a fan-shaped measuring ruler. According to the invention, the arc length between two equally latitudinal points of the spherical surface can be quickly measured, and the calculation time is saved. Meanwhile, an infant or a pupil can more intuitively feel the difference between the arc length and the straight length between the two points of the spherical surface, so that the demonstration efficiency of the arc length on the spherical surface is greatly improved. The understanding of students on the flight route of an aircraft is enhanced.

Description

technical field

[0001] The invention relates to a demonstration teaching aid, in particular to a teaching aid for demonstrating the arc length between two points of the same latitude on a spherical surface. Background technique

[0002] In the current teaching system of early childhood or elementary school education, in many cases, students cannot personally participate in it, resulting in a lot of knowledge that cannot be vividly passed on to students, such as the determination of aircraft routes. At present, the existing aircraft flight process demonstrations are basically displayed through pictures or audio-visual materials, and the images displayed through video materials are all in two-dimensional pictures or video modes, resulting in infants or primary school students not being able to intuitively understand the trajectory of the aircraft route. Can't understand that the arc length between two points on the plane's route is not the distance between two points. At this...

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