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在高一年级的一次诊断性测试中,一道有关轻杆弹力的试题引起了笔者的一点思考,并总结得出了规律,在这里与大家共同分享。题目:如图1所示,A B为一轻杆,一端插入墙中,一根轻绳BC的一端固定在墙上的C点,另一端系在杆的B端;已知AB=5 cm,BC=3 cm,A C=4 cm,在杆的B端挂一重40 N的物体P,系统静止时,在结点B处绳BC、杆AB受力各为多少?
In a high school grade diagnostic test, a question about the light pole stretch caused the author’s thinking, and concluded that the law, where to share with you. Title: As shown in Figure 1, AB is a light rod, one end is inserted into the wall, one end of a light rope BC is fixed on the C point of the wall, the other end is on the B end of the rod; AB = 5 cm, BC = 3 cm, AC = 4 cm, hanging in the B end of the rod weight of a 40 N object P, the system is stationary, at the junction B rope BC, the rod AB force each for how much?