河北省邢台市第二中学高中物理必修二课时训练:第五章11生活中圆周运动

适用年级:高一
试卷号:162290

试卷类型:课时练习
试卷考试时间:2018/2/24

1.单选题(共3题)

1.
在下面所介绍的各种情况中,哪种情况将出现超重现象(   )
①荡秋千经过最低点的小孩
②汽车过凸形桥
③汽车过凹形桥
④在绕地球作匀速圆周运动的飞船中的仪器
A.①②
B.①③
C.①④
D.③④
2.
如图所示,当汽车驶向一凸形桥时,为使在通过桥顶时,减小汽车对桥的压力,司机应

A.增大速度快速通过桥顶
B.以任何速度匀速通过桥顶都可以
C.以尽可能小的速度通过桥顶
D.使通过桥顶的向心加速度尽可能小
3.
如图所示,光滑水平面上,小球m在拉力F作用下做匀速圆周运动,若小球运动到P点时,拉力F发生变化,下列关于小球运动情况的说法不正确的是()

A. 若拉力突然消失,小球将沿轨迹Pa做离心运动
B. 若拉力突然变小,小球将沿轨迹Pa做离心运动
C. 若拉力突然变小,小球将可能沿轨迹Pb做离心运动
D. 若拉力突然变大,小球将可能沿轨迹Pc做向心运动

2.选择题(共3题)

4.下面各数中,一个零也不读出来的数是(    )。
5.下面各数中,一个零也不读出来的数是(    )。
6.阅读理解

    Do you love Beats headphones, True Religion jeans, and UGG shoes? These are some of the most popular brands (牌子) around. They are also expensive. But some experts say they are not much better than cheaper brands.

    For example, Jim Wilcox works for Consumer Reports. He tested all kinds of headphones. He says that $80 Koss Pro headphones provide basically the same quality (质量) and comfort as Beats. So why do people pay twice or even 10 times as much for the hottest brands?

    Experts say it's because fashionable, expensive brands send a message. Brands say “I belong” or “I can afford it.”

    Some people think that expensive brand names are worth the price. They say that some designer clothes really are top quality and that they last longer than cheaper brands. Some teenagers choose to wear popular brands because these brands make them feel good about themselves.

    Alexandra Allam, 17, likes to buy brand-name products. “I'd rather spend the extra money to get something I know I'll be satisfied with,” she says. Her friend Emmy Swan agrees, saying “As long as you can afford it, it seems reasonable to buy what you want.” But not all teenagers agree. “Spending hundreds of dollars for designer sunglasses is stupid and unreasonable,” says Daniel Steinbrecher, 16. “It's fake (假的) happiness.”

    People who are against wearing expensive brand names say that many designer brands aren't any better. “It's wasteful to buy things just because they are popular,” says Edmund Williams, 15. “You'll feel better if you buy things because you like them. If you have extra money to spend, it would be better to give it to people in need.”

3.多选题(共1题)

7.
在某转弯处,规定火车行驶的速率为v0.火车通过此处,下列有关说法中正确的是
A.当火车以速率v0行驶时,火车的重力与支持力的合力方向一定沿水平方向
B.当火车的速率v>v0时,火车对外轨有向外的侧向压力
C.当火车的速率v>v0时,火车对内轨有向内的挤压力
D.当火车的速率v<v0时,火车对内轨有向内侧的压力

4.解答题(共4题)

8.
在高速公路的拐弯处,路面往往设计成外高内低.设拐弯路段是半径为R的圆弧,要使车速为v时,车轮与路面之间的横向(即垂直于前进方向)摩擦力等于零,路面与水平面间的夹角θ应等于多少?
9.
修铁路时,两轨间距是1 435 mm,某处铁路转弯的半径是400 m,若规定火车通过这里的速度是72 km/h.请你运用学过的知识计算一下,要想使内外轨均不受轮缘的挤压,内外轨的高度差应是多大? ()
10.
杂技演员在做“水流星”表演时,用一根细绳系着盛水的杯子,抡起绳子,让杯子在竖直面内做圆周运动.如图所示,杯内水的质量m=0.5 kg,绳长L=60 cm.求:()

(1)在最高点水不流出的最小速率.    
(2)水在最高点速率v=3 m/s时,水对杯底的压力大小.
11.
汽车沿半径为R = 100m的圆跑道行驶,设跑道的路面是水平的,路面作用于车的最大静摩擦力是车重的,要使汽车不致冲出圆跑道,车速最大不能超过多少?()
试卷分析
  • 【1】题量占比

    单选题:(3道)

    选择题:(3道)

    多选题:(1道)

    解答题:(4道)

  • 【2】:难度分析

    1星难题:0

    2星难题:0

    3星难题:0

    4星难题:0

    5星难题:0

    6星难题:2

    7星难题:0

    8星难题:3

    9星难题:3