Cone volume formula derivation demonstration device for primary school mathematics teaching

Abstract

The invention belongs to the field of primary school mathematics teaching appliances. The invention particularly relates to a cone volume formula derivation demonstration device for primary school mathematics teaching. The device includes a base, a turntable is arranged at the upper end of the base; a bolt is sleeved in the turntable in a sliding manner; a bolt is slidably sleeved with the base, acountersunk groove is formed in the lower end of the base, the lower end of the bolt is connected with a nut through a thread, the outer side of the bolt is slidably sleeved with a pressure spring, an annular groove is formed in the upper end of the base, steel balls are arranged in the annular groove, and the upper ends of the steel balls are in contact connection with a turntable. The turntableis arranged at the upper end of the base, the turntable and the base are connected in a matched mode through the bolt and the nut, the annular groove is formed in the base, and the steel balls are arranged in the annular groove, so that the whole structure at the upper end of the turntable can rotate relative to the base, students at all positions can be demonstrated more conveniently, and the teaching quality is better.

Description

technical field [0001] The invention relates to the technical field of primary school mathematics teaching appliances, in particular to a cone volume formula derivation demonstration device for primary school mathematics teaching. Background technique [0002] The volume formula of a cone is a commonly used formula for calculating volume in primary and secondary school mathematics and physics. Although students can better understand the concept of the volume of a cone, the calculation of its volume is too abstract, especially the volume of a cone is one-third of the volume of a cylinder with the same base and height. The reasoning of this formula is quite difficult , so the knowledge about the volume of a cone often becomes a blind spot and a difficult point for students, and students only memorize this formula by rote, but they don't know why, and it is easy to remember it wrongly or not remember it. [0003] In the prior art, the cone volume formula derivation demonstrati...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of conical volume formula derivation demonstration device for primary school mathematics teaching, which solves the problem that it is not convenient to carry out continuous multiple demonstrations, and also solves the problem that it is not convenient for all students to watch, and solves the problem that the conical flask cannot be The problem that the water in the bottle enters the cylindrical bottle in sequence

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