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What is not parallel in the down phenomenon is that elevator a rises, mouse B moves and windmill C rotates Among these phenomena, what is not parallel is that elevator a rises, mouse B moves and windmill C rotates
C
When the windmill is blown by the wind, it is () phenomenon, and the elevator moves up and down is () phenomenon
Natural physics
The () in life is rotating; () do balance exercises?
When you pull out the plug of a bathtub full of water, there will be a vortex
For some reason, the water flows downward, and then the surrounding water needs to supplement to the center. Due to the influence of the earth's rotation, the moving objects are subjected to a rightward force, so the water has to go through a spiral line to flow to the center, so the water rotates
This is a phenomenon of rotation! The direction of vortex rotation is related to geographical location (magnetic field)!
Three rotation phenomena in life []]
Fan
revolving door
Bicycle wheel
What are the phenomena in life
Wheels and fans when starting bicycles and cars
What are the phenomena of translation? Come on, please! Tomorrow
If we are talking about translational friction, it can be divided into static friction, rolling friction and sliding friction
1、 Definition:
Translation refers to moving all points on a graph at the same distance in a certain direction in a plane. Such graphic motion is called graphic translation motion, which is referred to as translation [1]. Translation does not change the shape and size of the object. Translation can not be horizontal. It is isometric, It is a kind of affine transformation in affine space. It can be regarded as the result of adding the same vector to each point or moving the center of the coordinate system. That is, if a known vector is a point in space, it is translated. If the same point is translated twice, the result can be expressed by one translation, that is, therefore, the set of all translations is a group, which is called a translation group. This group is isomorphic with space, It is also a normal subgroup of Euclidean group E (n)
Basic properties:
After translation, the corresponding line segments are parallel (or collinear) and equal, the corresponding angles are equal, and the line segments connected by the corresponding points are parallel and equal; Translation transformation does not change the shape, size and direction of the figure (the two figures before and after translation are congruent)
Two key points:
1 direction of translation. 2 distance of translation
Function of Translation:
1. Fine graphics can be constructed through simple translation. 2. Translation is longer than parallel lines. Translation can translate an angle, a line segment and a graphics to another position. It is decentralized conditions concentrated on one graphics to solve the problem
Overall summary:
1 move a figure along a straight line as a whole to get a new figure. The shape and size of the new figure are exactly the same as that of the original figure. 2 each point in the new figure is obtained after moving a point in the original figure. The two points are corresponding points. The line segments connecting each group of corresponding points are parallel and equal. VI. characteristics of Translation: 1. The shape and size of the figure before and after translation remain unchanged, Position change. 2 the connecting lines of the corresponding points of the new figure and the original figure are parallel and equal. 3 the corresponding line segments of the new figure and the original figure are parallel and equal, and the corresponding angles are equal
Drawing method:
Take drawing a snowman as an example. You can cover the picture with translucent paper, first draw a snowman, then move the paper one after another in the same direction, and then draw the second and third... It is required to move horizontally or perpendicular to the original ladder (Van) in the vertical direction
The articles on the conveyor belt are moving obliquely
When the window is pulled, the window moves horizontally
On the construction site, the cement block lifted by the crane moves horizontally in the vertical direction
When skating on the ice, the skates move horizontally when they touch the ice
Hot air balloons float in the air and can translate in any direction. Elevators, car bodies, sliding windows and conveyor belts transport goods,
The plane is flying in the air,
And so on are translation phenomena
RELATED INFORMATIONS
- 1. 1. A cylinder with a side area of 1.44m2, a height of 0.9m and a bottom perimeter of? 2. If a cylinder with a bottom radius of 4cm and a height of 5cm is cut evenly along the bottom diameter, the surface area will increase?
- 2. What are the words that describe the vastness of the sea and grassland? Words, three
- 3. Who knows the touching composition about the sky loves the sea?
- 4. Will the ocean baby die? The ocean baby I raised was originally very smooth. Change the water. During observation, I found that several surfaces were rough, like they were going to be pasted. Is it going to "die"? Will the raised ocean baby grow up after drying and then raising in water?
- 5. (Translated) The following motions are not translational: A. The sliding of a car on the ground when braking hard B. The plane accelerated on the runway before taking off C. The movement of a kite in the air D. Cable car movement in the mountains
- 6. Translation does not change what and what of the graph, but only what of the graph?
- 7. What determines the translation of a graph? What and what does not change after the translation of a graph
- 8. Translate by vector By translating the image of function f (x) = 2Sin (x-pie / 3) according to vector a = (Pie / 6,2), the function desorption formula is
- 9. What about vector translation scalar shift Given the straight line L: x-2y + M = 0, the straight line L1 and circle (X-2) obtained by translating according to the vector a = (2, - 3) ²+ (y-1) ²= 5 tangent, m value?
- 10. Several blank filling questions in Mathematics ① A number consists of 4 percentages, 3 ones and 48 percentages. This number is () ② The product of two factors is 8.42. If one factor is 10 times larger than the other factor, the decimal point of the other factor moves two digits to the left, and the product is () ③ Two out of nine molecules increase by 6. If the fraction size remains the same, the denominator should increase ()
- 11. It takes 60 minutes for the minute hand of a clock to rotate at a uniform speed. Its rotation center is ___, After 20 minutes, the minute hand turned______ Degrees
- 12. When the minute hand on the clock rotates 120 °, the hour hand rotates __
- 13. The minute hand on the clock turns 60 times faster than the hour hand (right or wrong)
- 14. Imitation: the widest in the world is the ocean, the sky is wider than the ocean, and the human mind is wider than the sky
- 15. What color is the sea
- 16. The bubble of Theodolite Level tube is inconsistent and centered in the direction of 180 degrees. It is used to measure whether the straight line is feasible
- 17. Suppose the acceleration of the bullet is a = 5 × 10 fifth square meters, every second square second, barrel length x = 0.64M When shooting, gunpowder burns in the barrel. The expansion of gas promotes the acceleration of the warhead. We regard the motion of the bullet in the barrel as a uniformly accelerated linear motion, assuming that the acceleration of the bullet is a = 5 × 105m / S2 barrel length s = 0.64M, calculate the speed when the bullet shoots out of the muzzle Ask for a detailed answer, V ²- v0 ²= How did 2As come out? I know it's just to bring in the data and request the process of deriving this formula Is there a mistake on the first floor? There can't be t
- 18. Log base a true number (2 / 3)
- 19. If the log base 3 and the true number 2 = a, what is the log base 2 and the true number 9 equal to? And the second question, the trajectory equation of the point where the absolute value of the difference between the distances from the plane to two fixed points F1 (- 7,0) and F2 (7,0) is equal to 10 is? For example, X2 / 100-y2 / 16 = 1, which is written like this. It is troublesome to write the process, which is the knowledge points used,
- 20. How does the science teacher teach the first class well? Do you need a lecture in the first class? Or just talk about what is science, the history of science, and science stories? What else do you need to say? My little nephew is also going to the third grade. I asked him, do you want your science teacher to give you a little story in the first class or a class? He said he wanted to have class and don't talk too much nonsense. He said he was annoyed. So I didn't know how to have the first class