1/4单选题
难度：
1.一根劲度系数是
的弹簧原长是
，当它的长度变为
时，弹簧的弹力大小是 
，若使弹簧的长度再增加
，对弹簧施加的拉力需增大.
的弹簧原长是，当它的长度变为时，弹簧的弹力大小是 ，若使弹簧的长度再增加，对弹簧施加的拉力需增大. | A | 2N,2N |
| B | 2N,4N |
| C | 4N,2N |
| D | 4N,4N |
- 提示1：
- IOeUseiDoeWFi+WumuW+i+WPr+efpe+8jOW8ueewp+eahOW8ueWKmzxpbWcgd2lkdGg9MjgwIGhlaWdodD0yMyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzk3L0I1L3JCQUNFMU9UTVR1Umo1amhBQUFFckh0a214ZzUxNi5wbmciPg==
- 提示2：
- IOS9v+W8ueewp+WGjeS8uOmVvzxpbWcgd2lkdGg9MzAgaGVpZ2h0PTE5IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNUIvQTkvckJBQ0ZGT1RNVHVRUDZObUFBQUJlU282a0VVODU1LnBuZyI+77yM6ZyA5aKe5Yqg55qE5ouJ5YqbPGltZyB3aWR0aD0xOTEgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNUIvQTkvckJBQ0ZGT1RNVHZpWGxzN0FBQUQ1eGlhSGxNMjgzLnBuZyI+
正确答案：QQ==
55Sx6IOh5YWL5a6a5b6L5Y+v55+l77yM5by557Cn55qE5by55YqbPGltZyB3aWR0aD0yODAgaGVpZ2h0PTIzIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvOTcvQjUvckJBQ0UxT1RNVHVSajVqaEFBQUVySHRrbXhnNTE2LnBuZyI+77yM5L2/5by557Cn5YaN5Ly46ZW/PGltZyB3aWR0aD0zMCBoZWlnaHQ9MTkgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC81Qi9BOS9yQkFDRkZPVE1UdVFQNk5tQUFBQmVTbzZrRVU4NTUucG5nIj7vvIzpnIDlop7liqDnmoTmi4nlips8aW1nIHdpZHRoPTE5MSBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC81Qi9BOS9yQkFDRkZPVE1UdmlYbHM3QUFBRDV4aWFIbE0yODMucG5nIj4uIA==
2/4单选题
难度：
2.
如图所示，在一粗糙水平面上有两个质量分别为
和
的木块
和
，中间用一原长为
、劲度系数为
的轻弹簧连接起来，木块与地面间的滑动摩擦因数为
. 现用一水平力向右拉木块，当两木块一起匀速运动时两木块之间的距离是（）
如图所示，在一粗糙水平面上有两个质量分别为和的木块和，中间用一原长为、劲度系数为的轻弹簧连接起来，木块与地面间的滑动摩擦因数为. 现用一水平力向右拉木块，当两木块一起匀速运动时两木块之间的距离是（） | A |  |
| B |  |
| C |  |
| D |  |
- 提示1：
- 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
- 提示2：
- IOS6jOWKm+W5s+ihoQ==
正确答案：QQ==
5a+55pyo5Z2XPGltZyB3aWR0aD0xOSBoZWlnaHQ9MjMgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC81Qi9BNi9yQkFDRkZPVE1BM1FFRHI2QUFBQll4ZTc0bVkxOTEucG5nIj7vvIzmsLTlubPmlrnlkJHlj5fliLDmu5Hliqjmkanmk6blips8aW1nIHdpZHRoPTE2IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzVCL0E2L3JCQUNGRk9UTUEyaHpwcEVBQUFCTHhITC0wODc3OS5wbmciPuWSjOW8ueewp+W8ueWKmzxpbWcgd2lkdGg9MTcgaGVpZ2h0PTE3IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNUIvQTYvckJBQ0ZGT1RNQTNTRUJxSkFBQUJMbjhkSEswMTY1LnBuZyI+55qE5L2c55So77yM5YyA6YCf6L+Q5Yqo77yM5LqM5Yqb5bmz6KGh77yM55SxPGltZyB3aWR0aD01MCBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC85Ny9CMi9yQkFDRTFPVE1BMmdHLUw0QUFBQ0FIVC1BT1k2NzIucG5nIj7vvIw8aW1nIHdpZHRoPTU0IGhlaWdodD0yMyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzVCL0E2L3JCQUNGRk9UTUEyaFZIaWJBQUFDUWhPc05LYzAyNy5wbmciPuW+lzxpbWcgd2lkdGg9NjEgaGVpZ2h0PTIzIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNUIvQTYvckJBQ0ZGT1RNQTJ4b0hZZkFBQUNVV2dRRUFzMjY4LnBuZyI+77yM55Sx6IOh5YWL5a6a5b6LPGltZyB3aWR0aD00MyBoZWlnaHQ9MTkgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC85Ny9CMi9yQkFDRTFPVE1BM2dVd1Y5QUFBQnoxLXFYNms5NTMucG5nIj7lvpc8aW1nIHdpZHRoPTY0IGhlaWdodD0yMyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzk3L0IyL3JCQUNFMU9UTUEzaV9CSElBQUFDaEhzZ3g1Zzk5OS5wbmciPu+8jOWImeaciTxpbWcgd2lkdGg9NjEgaGVpZ2h0PTM5IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNUIvQTYvckJBQ0ZGT1RNQTJEV3M4VEFBQUN2eE9EMTFrMzk5LnBuZyI+77yM5pWF5Lik5pyo5Z2X6Ze06Led56a75Li6PGltZyB3aWR0aD0xMDUgaGVpZ2h0PTM5IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvOTcvQjIvckJBQ0UxT1RNQTNRRW9xVUFBQURSQ0F6bUNJNTI3LnBuZyI+LiDmlYXpgIlBLiA=
3/4单选题
难度：
3.
和
表示劲度系数分别为
和
的两弹簧，＞；
、
表示质量分别为
和
的两个小物体，＞，将弹簧与物体悬挂起来，如图所示. 要求两弹簧的总长度最大，则应使（ ）
和表示劲度系数分别为和的两弹簧，＞；、表示质量分别为和的两个小物体，＞，将弹簧与物体悬挂起来，如图所示. 要求两弹簧的总长度最大，则应使（ ） | A | 在上，在上 |
| B | 在上，在上 |
| C | 在上，在上 |
| D | 在上，在上 |
- 提示1：
- IDxpbWcgd2lkdGg9NTEwIGhlaWdodD00MyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzVCL0E2L3JCQUNGRk9UTUJXQzhLbExBQUFISEVKdTdnYzY2NS5wbmciPg==
- 提示2：
- 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
正确答案：RA==
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
4/4单选题
难度：
4.
如图所示，两木块的质量分别为
和
，两轻质弹簧的劲度系数分别为
和
，上面木块压在上面弹簧上（但不拴接），整个系统处于平衡状态. 现缓慢向上提上面的木块，直到它刚要离开上面的弹簧，在这过程中下面木块移动的距离为（ ）
如图所示，两木块的质量分别为和，两轻质弹簧的劲度系数分别为和，上面木块压在上面弹簧上（但不拴接），整个系统处于平衡状态. 现缓慢向上提上面的木块，直到它刚要离开上面的弹簧，在这过程中下面木块移动的距离为（ ） | A |
 |
| B |
 |
| C |
 |
| D |
 |
- 提示1：
- 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
- 提示2：
- 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
正确答案：Qw==
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