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同学们在学习中应具备质疑精神,要敢于发表自己的见解,勇于指出他人的错误观点.下面几例中考题取材于常见的错误,要明辨是非,就要看你有没有“慧眼”了.例1图1甲表示一个指甲刀示意图,图1乙是杠杆CBA结构示意图(杠杆CBA质量可忽略),其中B为支点,CB=0.5厘米,AB:4.0厘米,BD=0.4厘米,作用在C点上的力F1=10牛顿.求在A点所加的最小力是多少?
Students should have the spirit of questioning in their studies. They must dare to express their own opinions and dare to point out the wrong ideas of others. The following examples of exam questions are based on common mistakes. To distinguish between right and wrong, we must look at whether you have “eyes”. 1 Figure 1A shows a schematic diagram of a nail clipper, and Figure 1B shows a schematic diagram of the lever CBA (the quality of the lever CBA is negligible), where B is the fulcrum, CB = 0.5cm, AB: 4.0cm, BD = 0.4cm, acting at point C The force on F1=10 Newton. What is the minimum force to be added at point A?