CN2176574Y - 平行四边形法则教学演示器 - Google Patents

平行四边形法则教学演示器 Download PDF

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CN2176574Y
CN2176574Y CN 93228267 CN93228267U CN2176574Y CN 2176574 Y CN2176574 Y CN 2176574Y CN 93228267 CN93228267 CN 93228267 CN 93228267 U CN93228267 U CN 93228267U CN 2176574 Y CN2176574 Y CN 2176574Y
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白福海
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Abstract

一种平行四边形教学演示器，平行四边形的四个 边框板有三个板带箭头以表示力的方向，对角线用可 伸缩的教鞭或电视天线来与平行四边形各板之间用 铆钉连接。当长示力板与短示力板之间夹角变化时， 对角线的可伸缩的合成力板也伸缩变化，从而提高教 学效果。

Description

本实用新型涉及一种教学仪器。
目前在中学物理课矢量力合成平行四边形法则或三角形法则教学时，通常是教师在黑板上画出示意图，为了详细讲解，分别画出两个矢量力在不同角度（如0°，180°等）的示意图。由于学生不能完全直观看出两个矢量力在每一个角度的合成力大小，因此学习起来理解效果较差。
本实用新型的目的是提供一种可以直观演示两个矢量力在每个角度合成情况的教学仪器。
本实用新型的目的是这样实现的：平行四边形的四个边框板中，两两对应等长，且一个带箭头形状的长示力板，两个带箭头形状的短示力板和平行四边形对角线的合成力板，其各自两端处每板之间用铆钉连接。无箭头的长边框板上，在长示力板长度与短示力板长度之差处开一个凹口。平行四边形对角线代表的合成力板采用可伸缩的教鞭或电视天线。
此种教学演示器不但可以显示两个矢量力在0°、180°时的合成情况，还可以反映不同角度的合成情况，教师借助此演示器教学时使学生易于理解，同时它生产简单，成本较低。
下面结合附图详细进行叙述。图1为演示器结构示意图。用薄不锈钢板制成有一端箭头指示的长示力板2、短示力板3、4和无箭头的边框板1，用教鞭作为平行四边形对角线代表的合成力板5。用铆钉将它们连接起来组成带对角线的平行四边形，使各板之间连接不松动而可绕铆钉转动。在边框板1上开出凹口6，用于卡在铆钉上，以保持各板平整合并为一直线，其位置在长示力板2与短示力板3的长度之差处。如图1所示，当α变大或变小时，合成力板5缩短或伸长，并代表短示力板3代表的矢量力与长示力板2代表的矢量力之和，同时也可适用于三角形法则，代表短示力板4代表的矢量力与长示力板2代表的矢量力之和。

Claims (3)

1、一种平行四边形法则教学演示器，是由四个边框(1)组成的，其特征在于四个边框板(1)中有一个带箭头形状的长示力板(2)与边框板(1)等长，有两个带箭头形状的等长的短示力板(3)、(4)，并有一个合成力板(5)，边框板(1)、长示力板(2)与短示力板(3)、(4)组成平行四边形，合成力板(5)为此平行四边形之对角线，并且每板之间的端点处用铆钉连接。
2、根据权利要求1所述的演示器，其特征在于边框板（1）上有凹口（6），其凹口（6）位置在长示力板（2）的长度与短示力板（3）的长度之差处。
3、根据权利要求1或2所述的演示器，其特征在于合力板（5）为可伸缩的教鞭或可伸缩的电视天线。
CN 93228267 1993-05-24 1993-05-24 平行四边形法则教学演示器 Expired - Fee Related CN2176574Y (zh)

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CN 93228267 CN2176574Y (zh) 1993-05-24 1993-05-24 平行四边形法则教学演示器

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CN 93228267 CN2176574Y (zh) 1993-05-24 1993-05-24 平行四边形法则教学演示器

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110754752A (zh) * 2019-12-03 2020-02-07 酷波(厦门)进出口有限公司 滑杆式伞布支撑骨

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110754752A (zh) * 2019-12-03 2020-02-07 酷波(厦门)进出口有限公司 滑杆式伞布支撑骨

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