The paper points multiple choice and non-multiple choice questions in two parts

 The paper points multiple choice and non-multiple choice questions in two parts. Li River sub-100Examination time of 100 minutes.

2. Before answering, the candidate must be black with a 0.5 mm pen to his name, school name,Bailey UGG boots, exam number and so on to fill in the answer scripts within the seal or the corresponding position.

3. All answers should be written in the answer that corresponds to the location of the volume, otherwise answer null and void.

one multiple-choice questions (2 points for each question, a total of 24 points)

each of the following is only one correct answer, please fill in the serial number of correct answers on the answer scripts corresponding the box. Not vote, multiple choice or wrong choice of not to the point.

1. In your examination room where the air quality around (known air density is 1.29kg/m3)

A. Dozens of grams B. Several kilograms C. Hundreds of kilograms D. Tens of milligrams

2. . Small molecule B. Molecule is separable

C. D. interval between molecules Molecules in the never-ending land for the random motion

3. As shown in four different locations on the Earth were standing still with the Chinese people, polar bears, Argentina and penguins. The forces about them, the following statements is correct

A. Only polar bears and the Earth by gravity is balanced on its supportive

B. Penguin by gravity, the role of supportive and static friction

C. The direction of the Chinese people down by gravity; Argentine upward direction by the gravity

D. They are subject to gravity, and they are also attractive to the Earth

4. As shown, the pressure in the balloon with the left palm flat on the right hand index finger to withstand balloons, balloon in a static state deformation occurred, the following statements are true is

A. Refers to the pressure of the right hand over left palm on the balloon on the balloon pressure

B. Refers to the pressure of the balloon right over left palm on the balloon's pressure

C. Right hand finger pressure on the balloon is equal to the pressure of the balloon left palm

D. Gas pressure inside the balloon must remain unchanged



5. In the During the discussion, some students pointed out: paraffin wax on about the program. On A. B. Analysis and Demonstration Planning and design of experimental

C. Conjecture and assumptions D. Experiment with the gathering of evidence

6. As shown, the level with F = 6N uniform pull the pull the right animal blocks A, B the block stationary, then the indicator spring dynamometer number of 4N, the friction of the block B suffered size and direction

A. 6N, left B. 4N, right C. 6N, right D. 4N, left

7. Will be a toy frog into the water, it can float on water; put it into another liquid, it sank to the bottom. In both cases only the size of toy frogs buoyancy compared

A. The buoyancy in the water by the large B. By the buoyancy in the liquid large

C. Buoyancy as big D. Buoyancy can not compare the size of



8. The teacher is on the lecture podium, Mary and the students are learning instructor bottom edge experiment, which is a common scene in the physical classroom. Imagine, if the friction in the classroom suddenly disappeared, a phenomenon that may occur, the following statement in error is

A. Activities will chair the students have slipped a little on the ground

B. Screw fixed pendant slide from the ceiling, causing chandelier fell on the ground

C. Slide a pencil when writing and has been drifting from the hands in the air

D. The slippery, slightly tables and chairs will be a force on the ground kept sliding forward, bumped

9. As shown, the level of the two chopsticks in the middle put two table tennis, hollow plastic tube through the inter-force blow to the two goals, you will find two tennis

A. Close to each other B. C. away from each other Stationary D. In the same direction

10. Small high students by , carved on the surface at the zero scale line, and then at a distance of 10cm at zero-scale online side carved maximum weighing,UGGs, then the buoyancy of the biggest weighing scale is (g take 10N/kg)

A. 2N B. 0.2N C. 0.02N D. 20N



11. Following a variety of phenomena related with the frictional electrification phenomenon is

A. Easy to wear synthetic clothes covered with dust

B. Tanker transport of oil to the chain after a delay

C. Solar calculator to work under the light irradiation

D. In winter, you can often see the spark off the underwear

12. Metal foil is a density greater than water material. Li obtained a hollow tube made of metal foil, placed in a beaker filled with water and found it floating in the water, and then he and then this metal foil balled into the water, the metal foil into the bottom. Two cases were compared,cheap UGG boots, the following statements are true is

A. When the water sink to the bottom row of metal foil is less than the volume of discharge water when it floats the size of

B. When the metal foil by the buoyancy of floating sink to the bottom than it was when the buoyancy of small

C. Sink to the bottom when the foil is equal to its buoyancy by gravity

D. Floating metal foil by the gravity when the sink to the bottom than it was when the Gravity

Second, fill in the blank (1 point each blank, a total of 28 points)

13. Method can make the objects with friction charged. Friction over the glass rod with silk  power, because a glass rod in the friction process  optional

14. The following application or experimental phenomena:

(1) workshop in glass production, the use of a crane lifting a vacuum suction plate glass

(2) flying the balloon festival, to rise altitude above when two cases of ruptured

work with the use of atmospheric pressure ; can explain the increase of atmospheric pressure decreases with height have  (optional number).

15. Pat desktop, hand-feel pain, indicating that the role of force between objects 's. Pinch force empty cans, cans become flat, and this force can make an object that occurred .

16. Two drops of mercury near, can automatically combine into a larger drop of mercury, a fact that exists between molecules . Solid hard to be compressed, that exist between molecules . Mixture of alcohol and water volume was reduced, indicating .

17. Figure left for the store to use the platform scale, the balance of its working principle and the same. Use, the first rider to move the scale at the left end of O, if found weighbeam left upturned, the screws should be zero  (optional: Scales said the quality of an object, through the slot in the weight plate to add code to weighbeam balance, the increase of slot codes and rider's position, set as shown in Figure lower right, then the mass of the object  kg.



18. As shown, the force with 6N 1.5N hold the total weight of the glass still, glass by gravity and  are a pair of counterweights (optional friction If the hand grip strength increased to 8N, friction between the hand and cup the size of the  (optional If total weight of glass increased to 2N, hand holding the glass remains stationary, the friction between the hand and the size of glass into  N.

19. Of liquid pressure in the experiment, the teacher presented the device as shown in Figure A to the device by adding a certain amount of water, when you observe the phenomenon , indicating the end of a pressure of the liquid on the container. Later the teacher out of the pressure meter shown in Figure B prepared to explore the existence of the internal pressure of the liquid,UGG boots cheap, and Xiao-Ming that there was no need for a device you can use map. So the map A device Xiaoming slowly immersed in water, you will observe . To explore the characteristics of inner pressure of the liquid, which device is more suitable, and the reasons 

.



20. Learn about the balance of body condition, Xiao-Ming students made the following question: only the object by a force balance to maintain it? Force only by the two objects must balance status? Body is in balance only by a certain time Two forces play a role? he did as shown in the experiment, the object is in equilibrium when the forces.

(1) he will be a small ball hanging by a thread up, as shown in Figure (a) shows the ball after cutting the thread down, as shown in (b) below.

(2) he will also use two thread a ball hung up, as shown in (c) below, which cut a thin line, the ball swinging place, as shown in (d) of the instructions.

experimentally resolved his doubts. According to experimental results and related conditions, Xiao-Ming summarized preliminary results of the students:



(1) Figure (a) and (b) shows that: ; (2) by the map ( a) and (d) shows that: ;

(3) Figure (a) and (c) shows that: .

21. Load the balloon with a total of 2000N uniform along the vertical drop, it is subject to air buoyancy 1900N (known buoyancy is always vertical upward direction), it is in motion by the air resistance of the  N. If they throw away the number of weights from the balloon, the balloon can be uniform in order to increase the speed of the same size, then throw away the heavy weight  N (established by the air balloon the buoyancy and the air resistance of the same size).

22. As shown, a half-rolled up to the hard disk placed on the table. If you look below it blowing hard, you can find the hard disk will not flip over. This is because the fluid pressure and fluid flow  related to the hard disk of gas blow air pressure below  (optional



23. Sitting in a small high-speed V constant speed of the train carriage, found on the level of egg on the desktop suddenly along a stationary picture (top view) as shown in dashed line movement from A to B, as shown, then when the train is  drive (optional

24. Commonly used in the precious metals, ; if the minimum weight with the balance of mass 5g measure the quality of the code indicates the value of the balance of the tour should  g (gold = 19.3 × 103kg/m3).

Third, mapping and experimental questions (25 questions, 4 points; the first 26 items, 8 points; 27 ~ 29 items. each of 6 marks; the first 30 questions, 8 points; Question 7 of 31 points; 32 5 points; a total of 48 points) 25. Test according to requirements mapping.

(1) As shown, the weight G of the small ball rolling along the smooth slope. Draw a force diagram of the ball.

(2) weight of 20N in the level of small ball resting on the ground, try to draw the ball icon in force suffered gravity.



26. Practice of a school group of students in the use of devices as shown in Figure A to explore / N of a block of two pieces of wood stacked flat smooth surface on its side 1.3 2.6 1.3 2.6 1.8 3 flat rough surface on its side, 1.5 3 (1) there is a table of data is certainly unreasonable, this data is  , resulting in the data may be due to the unreasonable ;

(2) Please analyze the data in the table can be concluded that: the size of sliding friction has nothing to do with .

(3) many of my classmates pointed out the shortcomings of the method of experimental operation, so for the following improvements: with spring dynamometer pull pieces of wood, and to spring dynamometer fixed and pulling hard wood (Figure B). Uniform motion if the long board, wood and sliding friction between the long wooden  (optional accelerated motion, the pieces of wood and long wooden  sliding friction between the dynamometer readings. Please tell the improved methods of operation which benefits (please write them a little.)



27. The density of 0.6 × 103kg/m3, volume 100cm3 of wood into a liquid, the wood floating in the surface, there is l / 3 the volume of exposed surface. Requirements:

(1) gravity is much wood.

(2) by the buoyancy block is how much.

(3) make the wood just immersed in the liquid, how much should be added to vertical downward pressure?

28. Typically, objects in the same mud, pressure, pressure is the same as if the indentation depth is the same. Wildlife investigators found that black bears in the wild, mud, just leave footprints. Ji counted for the quality of black bear, he put a container of the bottom area is 10cm2 footprints on the mud near the ground, then slowly pour the sand into the container until the container left in the mud with the same depth of black bears traces of footprints , measured in this fashion the total mass of the container of sand 1.25kg (g take 10N/kg). Q:

(1) loading a container of sand the pressure on the mud what?

(2) Measure the bear's foot prints and contact with a total area of 800cm2, estimate the black bear How much quality?

29. Little Red's mother to a craft shop and bought a solid alloy with magic arts and crafts, the shop assistant told her: This is a quality equal to craft gold and copper blend of the two metals (assuming the total volume do not change), gold (gold quality) to 50%. Little Red's mother on the salesman's words: skeptical. Let red be validated. The experiment measured red quality crafts 600g, volume 52cm2, and identified the gold from the textbooks, the density of copper were 19.3g/cm3 and 8.9g/cm3.

(1) the experimental results according to calculation of red density of arts and crafts.

(2) according to the salesperson said, to calculate the density of arts and crafts, and describes the words of salesperson credibility.

30. Scooter for simple structure, so that the rapid slide in the play when the wind speeding acquire a pleasure, so more and more young people like, as shown, a child is

(1) Figure (a) shows, the children who play with one foot standing on it, the other foot back pedal force from time to time, due to the role of force , and the scooter forward.

(2) Figure (b) below, scooters, according to the player's height to adjust the height. Wither the lever to the appropriate height, tighten the knob section withered,  to increase by increasing the friction, play the role of the fixed rod. Some patterns carved on the handlebars is to increase the  to increase the friction.

(3) When the player after the stomp your feet off the ground, scooters because  moved forward some distance, and scooters leaving due to the friction effect of the speed continuously .

(4) a variety of scooters can be difficult to move, but easy to swing the body, so that the body weight shift, the player, especially those beginning to play more out of balance lead to accidents. If your scooter students also love to play, you give him (her) a few suggestions for its physical exercise also improves self-protection. (You can write a little) .



31. Spring is the season for kite flying, Xiao Ming and his father prepared to tie yourself a kite to fly.



(1) they found some bamboo, shaved bamboo (as a part of the yellow bamboo, called the Shiraia inside, the outside part is called undergo all sorts of blue), as a kite framework, Xiao Ming asked why do not iron, Little Daddy said it was because bamboo is not only good elasticity, and .

(2) Xiao Ming father kites, it will be three of the Bamboo bar sideways  (fill in B), Xiao Ming ask why you want to do, Xiao Ming father answered as kite flying, the role to be deformed by the wind, so that bar, the kite can be more natural deformation.

(3) After the truss framework, Little Father of paper with a glue stick to the frame of the kite, and finally glue the two kite tail below (Figure C), Little asked the two tails What's the use?

Xiaoming father said this is the role of two tail .

(4) well after the kite, riding a gust of wind, the kite Xiaoming successfully put the sky, the kite is mainly due to ascend to high altitude kite by ()

A. Kite gravity B. Air buoyancy C. The pull of the kite line D. Wind pressure

(5) you own experience, to name a kite-flying and related phenomena encountered physical knowledge.

phenomenon: . Relevant physical knowledge: .

32. Learning students see the two lead weights The following can also be linked to two 50g hook code, as shown. Why is this? Students to actively think about, took the floor, the debate is very intense.



(1) Wang Qiang group where students think that this is due to be below the bottom of the lead block up the atmosphere of find a basis point. Their approach is: spring dynamometer measurements with a piece of lead weight below 1.5N, with a graduated scale cross-sectional area were measured and considered as a piece of lead 3cm2. Please complete the calculations for them. And apply the results to them on the ground (atmospheric pressure to take 1.0 × 105Pa).

(2) where the group Wu Li discussed, skeptical view of the above, they think it may be nothing to do with the

atmospheric pressure. If there is no atmosphere to create a lab environment, you can test small

group Hao view is correct. You to design an experimental program.