Stone-wood block-aluminum block-copper block-paraffin block unit with holes for rope passing

Abstract

In the teaching of "density" in junior high school physics, to measure the density of stones, wood, aluminum, copper, and wax, one needs the teacher to find and make suitable stones and wood; Wooden blocks, aluminum blocks, copper blocks, and wax blocks are tied with thin wires, so that they can be put into the measuring cylinder to measure the volume and then taken out. Since their horizontal length is greater than or similar to the inner diameter of the measuring cylinder, they often appear to be distorted when taken out. Stuck in the graduated cylinder cannot be removed. The beneficial effects of the present invention are as follows: 1. The trouble of finding and making suitable stones and wooden blocks for teachers is eliminated. ②. Since the knotted thin wire passes through the middle of the thin ends of stones, wood blocks, aluminum blocks, copper blocks, and wax blocks, after putting them into the measuring cylinder to measure the volume, lift the thin wire to extract them vertically out without getting stuck in the graduated cylinder. ③, because stones, wood blocks, aluminum blocks, copper blocks, and wax blocks can be made into long shapes, it is guaranteed that they can be made into suitable volumes according to the needs of measuring density.

Description

【Technical field】 [0001] The invention relates to a device, in particular to a teaching device. 【Background technique】 [0002] In junior high school physics textbooks, the chapter "Density" is the focus of teaching. For the teaching of density, demonstration experiments and student experiments must be done well: measure the density of substances. There are two problems in measuring the density of stones, wood, aluminum, copper, and wax: first, there are generally no stones and wood in physical laboratories, and teachers need to spend time and energy to find and make suitable stones and Wooden blocks; second, in order to facilitate the measurement of volume in the measuring cylinder, thin wires should be tied on stones, wooden blocks, aluminum blocks, copper blocks, and wax blocks. After putting them into the measuring cylinder to measure the volume, lift the thin wire Take it out, because their horizontal length is greater than or similar to the inner diameter of the grad...

AI Technical Summary

Problems solved by technology

There are two problems in measuring the density of stones, wood, aluminum, copper, and wax: first, there are generally no stones and wood in physical laboratories, and teachers need to spend time and energy to find and make suitable stones and Wooden blocks; second, in order to facilitate the measurement of volume in the measuring cylinder, thin wires should be tied on stones, wooden blocks, aluminum blocks, copper blocks, and wax blocks. After putting them into the measuring cylinder to measure the volume, lift the thin wire Take it out, because their horizontal length is larger than or similar to the inner diameter of the measuring cylinder, it is often not smooth to take it out, often stuck in the measuring cylinder and cannot be taken out, which is annoying

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