bet365 login id:bet365,login,Professor,Hua,sai:'Professor Hua said: 'Is Liv pregnant? 'The result of falling from the sky is a sigh of relief Suning also agreed with this 【Classroom Guide】Spring 2017 Shanghai and Guangdong Edition Eighth Grade Physics Book (Exercise) Chapter 7 'Spor

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【Classroom Guide】Spring 2017 Shanghai and Guangdong Edition Eighth Grade Physics Book (Exercise) Chapter 7 'Sports and Power' Word Unit Test Data Download [Classroom Guide] 2017 Spring and Summer Edition Eight Years Physics Book ( Exercise) Chapter 7 'Sports and Power' Word Unit Test 7.1 How to describe the movement 1. The whole universe is composed of ________ substances, absolutely ____ objects are not, usually we call the movement Or stationary is ______. In physics, ______ is called mechanical motion. 2. When describing the motion of an object, first select ______. Select different ______ to judge the motion of the same object, and the result is not The same, so that sports and static have ______ sex. 3. A, B two students side by side cycling, if you choose class A as a reference, class B is ______, if you choose the building as a reference, Both A and B are ______. 4. The person sitting in the moving helicopter sees the top of the building moving vertically upwards. At this time, the person uses ______ as a reference to describe the movement. If the ground is used as a reference, the aircraft is doing the exercise of ____________ (fill in Up' or 'down'). 5. 'The moon is moving through the clouds.' In this sentence, the moon is ______, the cloud is ______. (fill in the 'research object' or 'reference object') 6. Bus On the road, if the roadside trees are used as reference objects, the passengers on the bus are ______; if ______ is used as the reference, the passengers are still. 7. The geosynchronous communication satellite launched by China, it Relative to the earth is ______, relative to the sun is ______. 8. We usually say: 'Rising Sun is rising', using ______ as a reference. The pilot recalled the scene of the aircraft diving, saying: 'The earth comes on the head', he is using ______ as a reference. On the straight road, three students, A, B and C, ride bicycles to the east, A feels downwind, B feels no wind, C Feeling the headwind, it is possible to determine that the wind is ______ wind. If you use B as a reference, A to ______ sports, C to ______ sports. 10. Xiao Ming sits in a moving car, since Moving west to east, he is ______ relative to the building on the ground, relative to the car that is ______, relative to the steam with him. The same speed, the other car in the same direction is ______, the same speed as the car he is riding, the other car in the opposite direction is ______.11. The lyrics of a song sing: 'The moon In the white lotus-like clouds, the reference object selected here is () A. Ground B. Cloud C. Man D. Moon 12. One person rides a bicycle from south to north, when a car is also from south to south. North is passing by him. If this car is used as a reference, this person () A. moves northward B. moves southward. C. Still D. The direction of movement cannot be determined. 13. The verse 'Flourishing scenery, Look at the mountains just like to come and meet, look at the mountains carefully, the mountains do not move, it is a boat.' Among them, 'seeing the mountains just like coming to meet' and 'is a boat trip' selected reference objects are () A. ship and mountain B. mountain and boat C. Mountain and water D. Water and mountains 14. Regarding mechanical movement, the following statement is correct () A. The flow of air is not mechanical movement B. The movement route is straight, the movement path is constant motion is the machinery Movement C. An object position change is motion, position does not change or is stationary D. Determine whether an object is moving How to exercise, leaving the reference object, lost meaning 15. A brave drifter, sitting on a rubber boat in the rushing river, down the following, the following statement is correct () A. with the shore of the tree For the reference object, the person is stationary B. The ship is the reference object, the river water is the flow C. The river water is the reference object, the person is the static D. The river water is the reference object, the person is the movement 16. The roadside is seen The trees move southward. B sees A still, if trees are used as reference objects, then () A. A and B move northward. C. A and B move southward. D. A moves northward. South Movement D. A moves south, B moves north 17. A train on a straight track, a cup placed on the small table of the car, which of the following objects is sporty () A. This train B. Passengers sitting in the chair of the carriage C. Closed door D. The conductor who walked by the side 'Exploration - Comparing the speed of moving objects' 1. In the physical examination, the time spent by the two students A and B running 1000 meters respectively It is 3 minutes 30 seconds and 3 minutes 50 seconds, then () A classmates' speed is big B B classmates' speed is big C A, B two classmates speed It is impossible to compare with D, who has a high speed and two objects that do uniform motion. The following statements are correct: () A long-distance object passes a long distance; B passes a long-distance object, and the time used must be long; C passes For the same distance, the object with a short time is fast; D is equal in the distance between two objects in equal time. 3, the fastest sailfish in the water, the speed can reach 108km / h, the fastest cheetah on land, can run 40m per second, the fastest flying brown sea Swallow in the air, can fly 5km per minute, compare their speed Size, the following is correct () A. Cheetah maximum B. Sailfish maximum C. Brown Swallow maximum D. Three as big as 4, to the moon to launch laser, after receiving the laser reflected back from the lunar surface, then the moon and the earth The distance between them is (laser propagation velocity in space C=3×105km/s)()××105kmC3×108kmD3×105km5, try to determine which of the following movements is a uniform linear motion ()A is starting the car B in the straight The train C is thrown out of the train C is thrown out of the stone D from the height of the free fall of the stone 6, an object to do a uniform linear motion, when it passes the 45m distance when it takes 30s, then it is within 15s The speed is () / / sC2m / sD3m / s7, a high-rise building outside a school playground is 170m away from the starting point of the runway. During the running training, the students heard the two-time gunshots due to the echo. If the speed of the sound in the air is 340m / s, then the interval between the two shots is about (), the length of a team is 50 meters, the speed / s, after a 100m culvert, when the team all through the culvert At the time, a total of () A60sB40sC50sD80s9, an escalator can be used to send the person standing on the ladder to the building for 20s, and the escalator will go up for 30s when it is not moving. It takes time for people to walk along the escalator of the movement () A, 50sB, 10sC 12sD, 20s10, an aircraft for uniform linear motion, flying 1000 meters in 5 seconds, how fast is it? How many kilometers per hour? 11. The length of the fuse for blasting is 2cm/s. When someone ignites and runs at 5m/s, can he run to a safe area of ??180m? 12. A train with a length of 200 meters is used for uniform linear motion. The time taken for the whole train to pass the kilometer long bridge is 100 seconds. So, how many meters per second does the train travel? Exploring the basics of how objects are not affected by force: 1. Newton's first law of motion 2, inertia 3, inertia phenomenon 1. The tank truck that transports liquid cargo on the right, there are bubbles on the liquid, when the car starts, the bubble will be ___________ _ exercise; brakes, bubbles will move to ____________, the reason is that ____________ has inertia.

?A. Jump forward in a stationary train and jump farther? B. In a train moving at a constant speed, jump in the direction of the car and jump farther? C. In a train that moves at a constant speed, jump in the opposite direction of the car and jump farther? D. In the above three cases, the distance between people jumps is the same? 3. A wooden board is erected on the trolley to make a uniform linear motion with the trolley. When the trolley suddenly decelerates, the wooden board is dumped forward because the (A) board has inertia and the upper end is subjected to Have a horizontal force forward B. The wooden board has inertia, and the lower end is subjected to a horizontal force C. The inertia of the board is large, and the inertia of the car is small. The inertia of the upper end of the wooden board is large, and the inertia of the lower end is small) A. Reduce the quality and make the movement state easy to change. Reduce the quality, making the movement state difficult to change C. Increase the inertia, making the movement state easy to change D. Increase the inertia, so that the movement state is not easy to change. 5. After the skydiver jumps vertically from the middle door of the plane flying at a constant speed, before looking up the plane without looking up the parachute (without air resistance), he found ()? A. The plane is flying overhead. B. Is the plane flying above the front? C. The plane is flying in the upper rear. D. Where is the plane depending on the speed? The person sitting in the bus in the direction of the car suddenly feels that the back of the seat is pressed against his back. At this time, it can be judged () A. It must be that the car suddenly slows down. Must the car suddenly accelerate? C. Must be a car emergency brake D. It must be that the car is in a sharp turn) A. Continue to make a circular motion B. Do a uniform linear motion C. Move vertically downwards D. Still in the air 8, as shown in the figure, when a truck is driving to the top of the arched bridge, suddenly the external force is completely gone, then the truck will () A. Slid down along the deck to B. Slide down the bridge deck C. Do a uniform linear motion D. Deceleration along the deck surface) A. Changes in external factors do not change the inertia of the object. Inertia is the law of inertia C. The moving object suddenly stops to have inertia. The greater the speed of the object, the greater the inertia. 9. Regarding inertia, the correct one in the following statement is ( ) A. A stationary object has inertia B. An object that has a uniform linear motion has inertia. Inertia D is only when the direction of motion of the object changes. The object has inertia under any circumstances. 10. The following phenomena are independent of inertia () A. Long jump athletes take a distance to take off. The 100-meter runner can't stop immediately after reaching the end. The weightlifter lifts the barbell in the air and does not move. The football kicked out continued to fly forward 11. 'Ten car accidents nine times faster, as well as drinking and overloading.'

During the driving of a horizontal road, speeding and overloading are likely to cause traffic accidents. The following statement is correct () A. The greater the speed of the car, the smaller the kinetic energy. The greater the speed of the car, the greater the inertia. The greater the quality of the car, the greater the inertia. The greater the mass of the car, the greater the potential energy. How the object moves when the force is applied. 1. The object will remain _________ or _________ under the action of the balance force.

2. The two forces acting on the same object, if ________, _________, _________, these two forces are balanced with each other.

3, the following statement is correct () A. When the object is not affected by force, it must be stationary. If the object is not affected by force, it must be made to move at a constant speed. The object can be moved by force. D. The moving object is not affected by external force, it will do a uniform linear motion. 4 The following statement is correct () A. When an object exerts a force on the object B, the object A must also be subjected to a force. Two forces that balance each other, the three elements of these two forces may be the same C. A car that does a uniform linear motion must receive a combined force of zero D. An object is subjected to force, and its movement state must be changed. 5. When Xiaoying students are shopping in the supermarket, they use a horizontal force of 5N to push a small car to make a uniform linear motion on the horizontal ground. At this time, the resistance of the car is _ _______N. Suddenly, Xiaoying found a child in front of her. She immediately pulled the car with the horizontal force of 10N to slow down the car. In the process of deceleration, the resultant force of the car was ________N (assuming the size of the resistance of the car is not change). 6. As shown in Figure 7-4-1, fill the glass with rice, insert the bamboo chopsticks vertically into the rice, and then slowly lift the glass in the vertical direction with bamboo chopsticks so that the glass is in the air. Stationary state. It is known that the total mass of the glass and the rice is 0.8 kg, and the total gravity of the glass and the rice is ________N, and the force balanced with the total gravity is ________ force. (g take 10N/kg) 7. As shown in Figure 7-4-2, the wooden block placed on the horizontal wooden board is subjected to the horizontal pulling force to make a uniform linear motion, and analyze the one received in the horizontal direction of the wooden block at this time. The balance is () A. The tension of the spring dynamometer on the block and the friction of the board B. The tension of the spring dynamometer on the block and the tension of the block against the spring dynamometer C. The friction of the block and the tension of the block against the spring dynamometer D. The friction of the block and the tension of the spring dynamometer on the block 8, as shown in Figure 7-4-3, the following pairs of forces belong to a pair of balance forces () A. Table pressure on the ground and ground support on the table B. The gravity of the table and the pressure of the table against the ground C. The gravity of the table and the support of the ground to the table D. There is no balance in this figure. 9. When the small dog is as shown in Figure 7-4-4, the rope of the hyena is pulled hard. It is deadlocked. If the gravity of the rope is not counted, the following statement is wrong () A. Xiao Ming’s combined strength is zero. The force of Xiao Mingla's rope and the force of the dog pulling the rope are a pair of balance forces. Xiao Ming must be affected by the imbalance. D. Xiao Ming’s state of motion is constant. 10. Xiaohong uses a horizontal force to push the table on the horizontal ground, but it is not pushed. This is because ( ) A. The thrust is less than the frictional force experienced by the table at this time. The gravity of the table is balanced with the support of the ground on the table, so the table does not move horizontally. C. The red thrust on the table is equal to the thrust of the table against the red. The thrust is balanced with the friction of the ground against the table, and the resultant force is zero. As shown in Figure 7-4-6, the two vertical splints clamp a wooden block, the force used to pull the wooden block upwards at a constant speed is 55N, and the force used for pulling out at a constant speed is 25N, what is the mass of the wooden block? (g take 10N/kg)? Figure 7-4-3 Figure 7-4-2.

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