问题 问答题

(1)如图所示,滑雪运动员保持身体姿势不变,从斜坡上滑下后用力撑杆,飞速向前滑去,请根据此情景提出两个与物理知识有关的问题,并加以解释。

(2)生活中处处有物理,只要你留心,身边的许多物品都可以用来做物理小实验。现有一个矿泉水瓶、一块海绵、适量的水,请利用这些物品设计两个物理小实验,只要求写出实验的做法和要说明的物理问题。

示例:矿泉水瓶在放手后从高处落下。说明:矿泉水瓶受到重力的作用。 

答案

(1)问题1:滑雪板的面积为什么做得较大? 解释;压力不变,增大受力面积,可减小压强。

问题2:为什么滑雪板下表面做得很光滑? 解释:减小接触面粗糙程度,从而减小摩擦。

问题3:运动员相对于什么是运动的?相对于什么是静止的? 解释:运动员相对于地面是运动的,相对于滑雪板是静止的。

问题4:运动员为什么能飞速向前? 解释:从斜坡滑下,重力势能转化为动能;用力撑地,力的作用是相互的,力改变物体的运动状态,从而使运动员飞速向前。(合理即可)

(2)①用力捏矿泉水瓶,矿泉水瓶变形。说明:力可以改变物体的形状。

②用力将矿泉水瓶扔出,瓶离开手后,继续运动。说明:物体具有惯性。(合理即可)

选择题
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Wanted, Someone for a Kiss

We' re looking for producers to join us on the sound of London Kiss 100 FM. You' ll work on the station's music programmes. Music production experience in radio is necessary, along with rich knowledge of modern dance music. Please apply(申请)in writing to Producer Vacancies, Kiss 100.

Father Christmas

We're looking for a very special person, preferably over 40, to fill our Father Christmas suit.

Working days: Every Saturday from November 24 to December 15 and every day from December 17 to December 24 except Sundays, l0:30 - 16:00.

Excellent pay.

Please contact (联系) the Enterprise Shopping Centre, Station Parade, Eastbourne.

Accountants Assistant

When you join the team in our Revenue Administration Unit, you will be providing assistance within all parts of the Revenue Division, dealing with post and other general duties. If you are educated to GCSE grade C level we would like to talk to you. This position is equally suitable for a school leaver or for somebody who has office experience.

Wealden District Council

Software Trainer

If you are aged 24 -45 and have experience in teaching and training, you could be the person we are looking for. You should be good at the computer and have some experience in programme writing. You will be allowed to make your own decisions ,and to design courses as well as present them. Pay upwards of £15,000 for the right person. Please apply by sending your CV (简历) to Mrs. R.. Oglivie, Palmlaee Limited.

小题1:Who should you get in touch with if you hope to work in a radio station?

A.Producer Vacancies, Kiss 100.

B.Mrs Oglivie, Palmlace Limited.

C.The Enterprise Shopping Centre.

D.Wealden District Council.小题2:We learn from the ads that the Enterprise Shopping Centre needs a person who   

A.is aged between 24 and 40

B.may do some training work

C.should deal with general duties

D.can work for about a month小题3:Which position is open to recent school graduates?

A.Producer, London Kiss.

B.Father Christmas.

C.Accountants Assistant.

D.Software Trainer.小题4:What kind of person would probably apply to Palmlaee Limited?

A.One with GCSE grade C level.

B.One with some office experience.

C.One having good computer knowledge.

D.One trained in producing music programmes.