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一、填空题
1.b
2.A C B
3.800 2000
4.略
5.30 不变_
二、选择题
6.D
7.A
8.B
9.B
10.C
11.A
三、作图题:略
四、实验与探究题
16.可避免横杆自重的影响,并便于从横杆上读出或测出力臂 左 六 3 竖直向上
17.4 2 杠杆将逆时针转动(或小赵观点正确)
18.失去惯性 使用滑轮组能省力
五、计算与应用题
19.(1)查表可知,锅内气压为2.0×105Pa;(2)压力差为30N;(3)应将G挂在离O点24cm处。
20.(1)图中C是动滑轮,A、B是定滑轮;(2)390N;(3)2.34×104N。