Demonstrator for position relation between two circles

A demonstrator, relational technology, applied in the field of teaching aids, can solve problems such as students' inability to deepen memory

Inactive Publication Date: 2011-04-20
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0002] In mathematics teaching, when talking about the "positional relationship between circles and circles", the teacher must draw a diagram of the relationship between

Method used

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  • Demonstrator for position relation between two circles
  • Demonstrator for position relation between two circles

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0009] refer to figure 1 The demonstrator of the positional relationship between circles and circles is a rectangular iron plate 1, a piece of sketch paper is pasted on its surface, and a fixed circle 2 is drawn in the center of the sketch paper; Move circle 3 slightly smaller circle. Fix a piece of magnet block 4 on the center of circle position of moving circle 3 back sides, establish a through circular hole on the side of magnet block 4, pass a long wire rope 5 in the through round hole, magnet block 4 is moved to the end of long wire rope 5 middle position, and make the magnet block 4 be fixed on the long wire rope 5; On the midpoint position of the two short sides of the rectangular iron plate 1, respectively fix a wire winder 6 with wheels, the long wire rope 5 that is fixed with the magnet block 4 The two ends are tied on the respective wire winder wheels 7; a U-shaped wire rope positioner 8 is respectively set on the rectangular iron plate 1 on one side of the wire wi...

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Abstract

A demonstrator for position relation between two circles is a teaching aid. Wherin a rectangular iron sheet flat is affixed with a sketch paper; a fixed circle is drawn on the sketch paper; another movable circle is disposed; a piece of magnet is disposed on the back side at the center of the movable circle, while fixed on a long cord; a bobbin winder and a U-shape positioner are respectively disposed at the middle of both short sides of the rectangular iron sheet flat; both ends of the long cord are tied to the bobbin winder wheels; and the long cord is configured through the center of the fixed circle. The advantages are that: by employing the demonstrator for position relation between two circles, students can intuitively know the plurality of relations between two circles in the circle motor process of the demonstrator, and find out the relationship between the distance of the two circle centers and the radiuses of the two circles in different position relationships. The demonstrator is convenient in operation and vivid, can leave a deep knowledge memory for students.

Description

technical field [0001] The invention relates to a teaching aid. Background technique [0002] In mathematics teaching, when talking about the "positional relationship between circles and circles", the teacher must draw a diagram of the relationship between circles and circles on the blackboard, which requires students to strengthen their memory, but students cannot deepen their memory through intuitive experiments. memory. Contents of the invention [0003] The purpose of the present invention is to provide a demonstrator of the positional relationship between circles and circles. The demonstrator of the positional relationship between circles is a rectangular iron plate, on which a piece of sketch paper is pasted, and a circle is drawn at the center of the sketch paper. A fixed circle; use a piece of transparent plastic paper to make a circle slightly smaller than the fixed circle. This circle is movable, so it is called a moving circle. A magnet block is fixed on the c...

Claims

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Application Information

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IPC IPC(8): G09B23/04
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