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如图是小明和小华设计的拉力健身器示意图，在拉环处加拉力时，滑杆PQ可随之自由滑动（导线对滑杆滑动无影响）．已知：在弹性限度内，弹簧伸长的长度与受到的拉力大小成正比．老师认为他们的设计有不足之处，应在...
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教案备课库《2016-2017学年度九年级物理作业电功率综合练习》真题及答案
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如图是小明和小华设计的拉力健身器示意图在拉环处加拉力时滑杆PQ可随之自由滑动导线对滑杆滑动无影响．已
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如图是小明和小华设计的拉力健身器示意图在拉环处加拉力时滑杆PQ可随之自由滑动导线对滑杆滑动无影响．已
图是小明和小华设计的拉力健身器示意图在拉环处加拉力时滑杆PQ可随之自由滑动导线对滑杆滑动无影响．已
图是小明和小华设计的拉力健身器示意图在拉环处加拉力时滑杆PQ可随之自由滑动导线对滑杆滑动无影响．已知
图是小明和小华设计的拉力健身器示意图在拉环处加拉力时滑杆PQ可随之自由滑动导线对滑杆滑动无影响．已
如图是小明和小华设计的拉力健身器示意图在拉环处加拉力时滑杆PQ可随之自由滑动导线对滑杆滑动无影响．已
图17是小明和小华设计的拉力健身器示意图在拉环处加拉力时滑杆PQ可随之自由滑动导线对滑杆滑动无影响．
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如图是小明和小华设计的拉力健身器示意图在拉环处加拉力时滑杆PQ可随之自由滑动导线对滑杆滑动无影响．已
图17是小明和小华设计的拉力健身器示意图在拉环处加拉力时滑杆PQ可随之自由滑动导线对滑杆滑动无影响．
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图是小明和小华设计的拉力健身器示意图在拉环处加拉力时滑杆PQ可随之自由滑动导线对滑杆滑动无影响．已知
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