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Examples of sliding friction, rolling friction and static friction in life
Static friction is the friction caused by no relative movement between objects. For example, when holding a cup with your hand, the cup does not move relative to your hand, but the cup does not fall, which is the static friction provided by your hand to the quilt. When you walk, the friction between the soles of your feet and the ground; The friction between the cable and the wooden pile when landing; Still in
"Another way of thinking, another angle" give examples in life Just one,
When two people go to sell shoes, they also go to a place where people never wear shoes. One person thinks: it's over, people here don't wear shoes, and my shoes can't be sold. While the other person thinks: great, people here don't wear shoes, and my shoes can be sold ~:)
What is the difference and relationship between translation and rotation? Please give an example
Translation is moving in one direction, such as a crab walking
The phenomenon of rotating at a point or an axis, such as opening a door
What is the use of translation and rotation patterns in life?
Windmill, needle on watch - rotation
Drawer --- translation
Tell me about the translation and rotation phenomena in your life
Rotation in life: screw the nut with a wrench, take water from the windmill, and the wind blade of the wind turbine rotates around the shaft
Translation in life: the car moves on a straight road, moves along a straight line, pushes and pulls the switch of the window, and pushes and pulls the drawer
Give five examples Examples of glory despite defeat should be classic
In 1968, at the Olympic Games in Mexico City, Tanzanian player ahawari was injured in the process of participating in the marathon. When he limped across the finish line with a bandage and bleeding leg, tens of thousands of people stood in silence, the audience stood up, and thunderous applause lasted for a long time. It was a feeling
RELATED INFORMATIONS
- 1. What is the difference between translation and distance? Please give an example
- 2. As shown in the figure, if the length, width and height of the elevator are 1.2m, 1.2m and 2.1m respectively, what is the maximum length of the bamboo pole that can be put into the elevator?
- 3. From the perspective of mechanical stress analysis, how to explain that the rotating tire rolls forward after the car starts? Or how to analyze the relationship between the tire and the ground Stress condition?
- 4. A train moved forward at the speed of 38m / s and whistled 600m away from a tunnel entrance. When the driver heard the echo, how far was the locomotive from the tunnel entrance? (the sound velocity is 340m / s) (do not set the unknown number method to solve, but answer in the way of known, seek and answer.)
- 5. Given log (12) 27 = a, find the value of LG (2) / LG (3)
- 6. The following indefinite integrals are obtained by the first type of substitution method (approximate differentiation method) or the second type of substitution method: 1）∫dx/[x*(x^6+4)]; (1/24)*ln[x^6/(x^6+4)]+c; 2) ∫cosxcos(x/2)dx ; : (1/3)sin(3x/2)+sin(x/2)+c; 3) ∫tan^3secxdx; : (1/3)(secx)^3-secx+c; 4 ∫dx/[x√(x^2-1)]; : arccos(1/x)+c; The answer has been given, please give the process. Do not require all answers, solve one by one
- 7. Proof of differential formula of inverse trigonometric function Complete steps to prove d (arctan x) / DX = 1 / (1 + x ^ 2) The two formulas cos ^ 2 y + sin ^ 2 y = 1 and 1 + Tan ^ 2 y = sec ^ 2 y can be used
- 8. A train advances at the speed of 20m / s and whistles 1800m away from a tunnel entrance. Q: when the driver hears the echo, how far is the locomotive from the tunnel entrance
- 9. A 200 meter long train passes a 1 kilometer long bridge at the speed of 40 kilometers per hour. How long does the train pass the bridge?
- 10. If a 200m long light rail train passes through a 2.8km overpass at a speed of 15m / s, how long does it take for the train to get on the bridge and completely pass the bridge?
- 11. Which objects are moving in life
- 12. When light passes through a glass plate, its intensity should be reduced by 1 / 10, and the intensity of light should be reduced to less than 1 / 3 of the original. At least such a glass plate; (answer: 11) How to solve it with log?
- 13. Please explain the difference between log and LG and LN, as well as their formulas,
- 14. Log (a ^ k) (m ^ n) = (n / k) log (a) (m) (n ∈ R) how to prove it? Please do not use the bottom changing formula
- 15. The idiom describing water flow, please 3Q
- 16. What is the teaching orientation of symmetry, translation and rotation? How to distinguish symmetry, translation and rotation in life?
- 17. Is the pendulum of a pendulum moving in translation or rotation The sooner the better
- 18. Give some examples of the constant movement of molecules in life The more, the better. A little more detail = = | (just a little more detail.)
- 19. What are the properties of translation and axisymmetry? What about rotation?
- 20. Who knows about mathematician stories, interesting mathematical stories, and mathematical knowledge? I want to make a handwritten newspaper, as long as it is about mathematics! Please help me find more and shorter, because I want to make a manual copy! thank you very mnsh! I repeat, shorter!