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江苏省泰州市兴化市2022-2023八年级下学期4月期中物理试题(答案)

八年级物理参考答案
一、选择题
1.A 2.C 3.B 4.A 5.B 6.C 7.D 8.B 9.C 10.D 11.A 12.B
13. 失去 乙 14. C B
15. 偏大 63.2 38 7.9×103 16. 不变 竖直向下 高
17. 压力 形变 左 18. 相同 ② ①
19. 改变 相同 力的作用是相互的 喷射的高温气体 运动状态
20. 锤头 错误 21.先增大后减小 静止
22.(6 分)
F
m 15.8kg
23.(5分)(1)V 3 3 2 10
3m3 ···········································2 分
7.9 10 kg /m
(2)m 碳=15.8kg-12.2kg=3.6kg ·······································································1 分
m 3.6kg 1.8 103 3 3 kg /m
3 ··················································2 分
V 2 10 m
24.(5分)(1)1······················································································································1 分
(2)m 水=ρ水·V 3水=1g/m ×100cm3=100g=0.1kg ·····················································1 分
G 总=G+G 水=G+m 水g=1N+0.1kg×10N/kg=2N ··················································1 分
(3)G 液=5N-1N=4N ··································································································1 分
m G
4N液
液 液 4g / cm3 ·····································1 分
V gV 10N / kg 100cm3
25.(4分)(1)见右图
(2)相同 不同 (3)从多组数据中寻找普遍规律
26.(4分)(1)物体所受重力大小与质量成正比
(2)合理 重合 (3)B
27.(11 分)(1)水平 匀速直线 (2)3和 4 (3)压力
(4)平衡 变小 变小
(5)> (6)右 是 =
28.(7分)(1)是 不可以 增加两侧钩码的数量(质量、重力)
(2)在两侧挂上不相等的钩码,松手后,观察卡片能否保持静止
(3)拉力 重力(或“重力 拉力”) 拉力
29.(8分)(1)bca (2)速度 (3)支持 (4)小 长(大) >
(5)匀速直线 不需要

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