问题
填空题
在图中，画出使轻质杠杆保持平衡的最小的力F的示意图（要求保留作图痕迹）．
答案
O为支点，所以力作用在杠杆的最右端，并且力臂是支点O到杠杆最右端的距离时，力臂最长，此时的力最小．确定出力臂然后做力臂的垂线即为力F．故答案为：
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在图中，画出使轻质杠杆保持平衡的最小的力F的示意图（要求保留作图痕迹）．
O为支点，所以力作用在杠杆的最右端，并且力臂是支点O到杠杆最右端的距离时，力臂最长，此时的力最小．确定出力臂然后做力臂的垂线即为力F．故答案为：
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My name is Jay. I'm an 1_______ boy. I'm twelve years old. My 2_______ is in London but now I'm in Beijing with my 3_______. I want some English or American friends. Are you Americans? I'm a student in Beijing No. 1 Middle School. I'm in Class Four. My classmates (同学) are all Chinese. They love me and 4_______after me. My English teacher is Miss Wang. She's very young. She's a nice girl. I 5_______ her very much. Yours, Jay |