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一堂有趣的科学实验课作文 小学三年级500字

An interesting science experiment class essay Primary school third grade 500 words

来源: 作者-lover_luzhou 日期:2019-09-09 11:54:13 分类:小学英语 阅读:

实验小学四(7)班 陈思昊

老师让同学们从家里带壹根毛线缝衣针、塑料泡沫和磁铁,做科学实验。老师给我们每人壹个装满水的小桶。我先把缝衣针在磁铁上反复摩擦,然后把针放在塑料泡沫上用透明胶布粘住,放到装满水的小桶中,让泡沫浮在水面上,动泡沫,看它停在哪里。通过多次反复实验,我发现停下来时,缝衣针尖总是指向南偏东方向。

这是磁场的作用。磁场是壹种看不见、摸不着的特殊物质,由运动电荷或电场的变化而产生。地球磁场是偶ji型的,近似把壹个磁铁棒放到地球中心,使它的北ji大体上对着南ji而产生的磁场形状,但并不与地理上的南北ji重合,存在着壹定的磁偏角。实验中,缝衣针在磁铁上摩擦被磁化了,在地球磁场的作用下,当针停下来时,就壹头指向地磁北ji,壹头指向地磁南ji,并不是指向任意方向,也不是正南正北方向。

Experimental Primary School 4 (7) Class Chen Sizhen

The teacher asked the students to bring a woolen sewing needle, plastic foam and magnet from home to do scientific experiments. The teacher gave each of us a small bucket filled with water. I will rub the needle on the magnet repeatedly, then put the needle on the plastic foam and stick it with a transparent tape. Put it in a small bucket filled with water, let the foam float on the water, move the foam, and watch it stop. where. Through repeated experiments, I found that when I stopped, the needle tip always pointed to the east-south direction.

This is the role of the magnetic field. A magnetic field is a special substance that is invisible and intangible, and is produced by changes in the motion charge or electric field. The earth's magnetic field is dipole-type, which puts a magnet rod in the center of the earth, so that its north pole is generally facing the shape of the magnetic field generated by the south pole, but it does not coincide with the geographical north and south poles, and there is a certain magnetic bias. angle. In the experiment, the needle is magnetized by friction on the magnet. Under the action of the earth's magnetic field, when the needle stops, one end points to the geomagnetic north pole, and one head points to the geomagnetic south pole, not pointing in any direction, nor is it just south and north. direction.

After the experiment was done, the teacher asked us to make a small game: sink the needle into the water, don't use it, how to take the needle out? I put the magnet on the outer shell of the bucket near the sewing needle, sucked the needle through the plastic bucket, slowly moved up, and finally sucked the needle out.

Through this interesting science experiment class, I learned a lot about magnetic fields.

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