1.单选题- (共7题)

A.升降机的速度不断减小 |
B.升降机的加速度不断变大 |
C.先是弹力做的负功绝对值小于重力做的正功然后是弹力做的负功绝对值大于重力做的正功 |
D.先是弹力做的负功绝对值大于重力做的正功然后是弹力做的负功绝对值小于重力做的正功 |
A.做匀加速直线运动 |
B.列车的速度和加速度均不断增加 |
C.列车的速度增大,加速度减小 |
D.列车做匀速运动 |
A.力对物体做功多,说明物体的位移一定大 |
B.力对物体做功少,说明物体的受力一定小 |
C.力对物体不做功,说明物体一定无位移 |
D.功的多少是由力的大小和物体在力的方向上的位移的大小确定的 |
A.物体的重力势能为 W1 | B.物体的动能为W1+W2+W3 |
C.物体的动能为W3﹣W2﹣W1 | D.物体的机械能为W3﹣W2 |
A. 做匀速直线运动的物体机械能一定守恒
B. 做圆周运动的物体机械能一定守恒
C. 做变速运动的物体机械能可能守恒
D. 合外力对物体做功不为零,机械能一定不守恒

A. q1、q2都是正电荷,且q1>q2
B. q1是正电荷,q2是负电荷,且q1<|q2|
C. q1是负电荷,q2是正电荷,且|q1|>q2
D. q1、q2都是负电荷,且|q1|<|q2|
2.选择题- (共2题)
阅读理解
In the last few years the popularity of eBooks has exploded.The advantages are clear:You can carry as many books with you as you want.You can simply download every book you like and instantly start reading instead of having to wait for the book to arrive by mail.
However,one thing hadn't changed.If you wanted to rent a book you were still forced to use hardcopy books.Until now that is, Amazon.com recently announced the start of a new program where you can rent eBooks.
Where to rent eBooks?
As mentioned before,Amazon.com is the first and currently the only retailer (零售商) that has a program in place for renting eBooks. Luckily,Amazon is the largest online retailer in the world and their eBook assortment (分类) is massive.They are also the producer of the Kindle,the most popular Reader,which means you can be sure that the eBooks you rent will work.
You can currently only rent Textbooks.But this is likely to change as soon as word gets out that you can save money by renting eBooks.
Why rent eBooks at Amazon?
* Save money:Save up to 80% of the normal price of the eBook.
* Decide how long you rent:From 30 days to 360 days,you decide how long you want it.You can extend the time by as little as a day.Or simply buy the eBook if you want to keep it after all.
*Use any device:If you rent an eBook from Amazon,you can read it on your PC,Mac,iPad,iPhone,Android device,Windows Phone 7.Blackberry.or Kindle.
* Keep your notes:Do you like to keep annotations (注释) and highlights in your eBooks?Don't worry.You can always revisit your notes and highlights through Amazon.com.
How to rent eBooks?
Simply search for the eBook you want to rent on Amazon.com and select the "Rent eBooks" option. After that,a new page will open where you can select how long you'd like to rent the eBook.You can read eBooks for a period of 30 to 360 days.
You decide how long you need the eBook.If you later find out you need it for longer, you can simply extend the time.Or buy it for the normal price whenever you want.
Once you've chosen the time you want to rent the eBook,you simply go to checkout.Or you can use the "Rent now" button.
3.多选题- (共3题)




A.物块的机械能逐渐增加 |
B.软绳重力势能共减少了![]() |
C.物块重力势能的减少等于软绳摩擦力所做的功 |
D.软绳重力势能的减少小于其动能增加与客服摩擦力所做功之和 |




A. 他的动能减少了


C. 他的机械能减少了


4.解答题- (共2题)

(1)汽车所受阻力的大小;
(2)汽车的质量.

5.实验题- (共2题)

(1)适当垫高木板是为了 .
(2)通过纸带求小车速度时,应使用纸带的 (填“全部”、“前面部分”或“后面均匀部分”).
(3)关于橡皮筋做功,下列说法正确的是 .
A.橡皮筋做的功可以直接测量 |
B.通过增加橡皮筋的条数可以使橡皮筋对小车做的功成整数倍增加 |
C.橡皮筋在小车运动的全程中始终做功 |
D.把橡皮筋拉伸为原来的两倍,橡皮筋做功也增加为原来的两倍. |
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【1】题量占比
单选题:(7道)
选择题:(2道)
多选题:(3道)
解答题:(2道)
实验题:(2道)
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【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:1
5星难题:0
6星难题:8
7星难题:0
8星难题:4
9星难题:1