问题 填空题

如图所示,用6N的力握住总重为1.5N的水杯静止不动,若将手的握力增大到8N,手与水杯之间摩擦力的大小将______(选填“变大”、“变小”或“不变”).若将水杯总重增加到2N,水杯仍然静止不动,则手与水杯之间摩擦力的大小为______N.

答案

∵瓶子静止、处于平衡状态,

∴瓶子受到的摩擦力等于瓶子的重力,

∵手的握力增大,瓶子重不变,

∴手与水杯之间摩擦力的大小不变;

将水杯总重增加到2N,水杯仍然静止不动,瓶子受到的摩擦力等于瓶子和水的总重,大小为2N.

故答案为:不变,2N.

阅读理解
阅读理解。
                 A timetable in Shanghai Pudong International Airport
AirlineFlight Number DestinationDepartureGate
Air Canada 137  Beijing    10:12 a.m.   24   
Japanese Airlines 320Tokyo 10:30 a.m. 18
British Airways 405Paris 11:00 a.m. 20
Pan American 226 London11:20 a.m. 12
Pan American 125 Beijing11:45 a.m.15
Air Canada  178 Tokyo 12:35 p.m. 21
CAAC 289 Hong Kong 12:35 p.m.14
CAAC314 Moscow12:45 p.m.18
British Airways 230  New York 12:55 p.m. 23
 
                                                Korean songs
     The Song and Dance Troupe (团) of the Republic of Korea will give a Song
and Dance show at 8:20 p.m. tonight at the Shanghai Centre Theatre.
Tickets: 60, 90, 120, 150 yuan RMB are available at the theatre's ticket office.
Address: 1463 Nanjing Road W, Shanghai
Tel: 28547945

                         (Chongqing Daily, December 15, 2005)
     The biggest shopping centre in Chongqing will open on December 25. Everybody with today's Chongqing Daily will get a small present that day. You are all welcome
to the grand opening.
Tel: 68426549
Address: No. 16 Youth Road, Jiefangbei

    (CHINA CUP FOOTBALL CONTEST, May 8, 2005)
Chongqing Lifan Team vs Shengzhou Pingan Team
TIME: 3:00 p.m. June 8, Saturday
PLACE: Datianwan Stadium
TICKET PRICE: RMB 50 (for adults) RMB 25 (for students)
NAME: China Cup Football Contest
1. A man is at gate 18. He is going to take the ______ plane to ______.
A. 11:00; Paris
B. 11:45; Beijing
C. 10:30; Tokyo
D. 11:45; Moscow
2. The audience in ______ can enjoy a Korean Song and Dance show at 8:20 tonight.
A. Chongqing
B. Shenzhen
C. Nanjing
D. Shanghai
3. When and where will the football match be held?
A. In Datianwan Stadium on Saturday.
B. In Datianwan Stadium on May 8.
C. In Shenzhou on June 8.
D. In Shenzhen Stadium on May 8
4. If you have a Chongqing Daily dated December 15, 2005, you will get a small present ______.
A. every day
B. from Chongqing Daily
C. on December 15, 2005
D. on December 25, 2005
5. If you spend one hundred and twenty-five yuan, you can buy ______.
A. three tickets for the football match
B. two tickets for the Korean Song and dance show
C. two tickets for the football match and a ticket for the Korean Song and dance show
D. a ticket for the football match and two tickets for the Korean Song and dance show
单项选择题