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中考物理力学试题

当前时间： 2026-08-12 06:46:33 分类：办公文件 评论(0)
中考物理力学试题

拉车和推车，哪一个更省力？（     ）

A.拉车

B.推车

C.一样

D.无法判断

解答:

原理

1. 拉车：拉力斜向上，有向上的分力，减轻车子对地面的压力→摩擦力变小，阻力更小。

2. 推车：推力斜向下，额外增大车对地压力→摩擦力变大，更费力。

所以拉车更省力。

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  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=bd05e20b8edc71390d6a8de3ef1f011f
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  1. CONNECT:[ UseTime:0.000871s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001434s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005966s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000702s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001305s ]
  6. SELECT * FROM `set` [ RunTime:0.000596s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001458s ]
  8. SELECT * FROM `article` WHERE `id` = 925104 LIMIT 1 [ RunTime:0.000959s ]
  9. UPDATE `article` SET `lasttime` = 1786533756 WHERE `id` = 925104 [ RunTime:0.016208s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000571s ]
  11. SELECT * FROM `article` WHERE `id` < 925104 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.008807s ]
  12. SELECT * FROM `article` WHERE `id` > 925104 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001200s ]
  13. SELECT * FROM `article` WHERE `id` < 925104 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001708s ]
  14. SELECT * FROM `article` WHERE `id` < 925104 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001724s ]
  15. SELECT * FROM `article` WHERE `id` < 925104 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006537s ]
0.155996s