What is the principle of light lever

The principle of optical lever measurement is the principle of measuring micro elongation by optical lever mirror ruler method

Please explain the lever principle to me

Lever principle lever is a simple machine; a strong stick (preferably not bent and very light) can be used as a lever. In the figure above, the square represents the weight, the circle represents the support point, and the arrow represents the force point. In this way, can you see? (Figure 1) in the right side of the lever, if you force downward, the weight on the left side can be

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1. How to explain the principle of balance with lever
2. The fulcrum of lever aocb is o. OA = CB = 40. OC = 30. OA vertical OC. OC vertical CB hangs 49 n object on A. B at least needs force to keep lever Ao horizontal. It has a direction of force A_________________ O l l l__________________ B C
3. In the experiment of exploring the mechanical efficiency of pulley block, what is the experimental principle
4. What are the rules of mechanical efficiency of pulley block? The more hook yards, the greater the mechanical efficiency
5. What factors are related to the mechanical efficiency of leverage
6. Why should the balance beam be made equal arm
7. What kind of lever is the balance? What principle does it use?
8. 1. Heating potassium permanganate to produce oxygen, the safe operation after the end of the experiment is first (), and then () 2. The function of ice water in water tank is () 3. It is proved that in the reverse catalysis test of hydrogen peroxide, 1.（） 2. Put manganese dioxide into large test tube and add 5ml hydrogen peroxide 3. After the reaction, filter, wash, dry and weigh the solid substance in the large test tube 4.（） After finishing this experiment, we need to prove the catalytic effect of manganese dioxide, and add an inquiry experiment: Inquiry () 4. The factors that affect the rate of chemical reaction may be ()
9. 1. Heat the white sugar in the pot until it turns black, and taste whether the black substance is sweet or not? 2. Take desiccant bag, add tap water and test its temperature change? 3. Take rust iron nail and white vinegar reaction 4. Take the polished nails and white vinegar to reflect 5. Take the outer metal skin of the battery and white vinegar to reflect 6. Add water to the battery contents, soak garlic, and test its germination, which is different from that of water 7. Take alkali surface and add white vinegar for reaction 8. Take different petal juice, add white vinegar and alkaline water to react
10. In the experiment of studying lever balance, the nuts at both ends of the lever should be adjusted so that the lever is balanced in its original position. At this time, when the lever is still balanced in its original position after the two ends of the scale are hooked, the distance from the point of action of the force to the fulcrum is equal to that of the force----
11. In the experiment of studying the conditions of lever balance, we should balance the lever in the horizontal position first. What is the purpose of doing this?
12. Students in a research study group used the following devices to explore the respiration of plants
13. Who is the source of oxygen in carbon dioxide produced by respiration Is it from oxygen
14. Animals and plants can inhale oxygen and exhale carbon dioxide. What is the function of organisms Now!
15. When plants breathe at night, they should absorb oxygen and release carbon dioxide as usual, but will they also absorb a little carbon dioxide to breathe? When plants breathe at night, they should absorb oxygen and release carbon dioxide as usual But will it also absorb a little carbon dioxide to breathe?
16. People and animals need to consume oxygen for breathing. Why can the volume fraction of oxygen in the air always maintain 21% 1. People and animals need to consume oxygen for breathing. Why can the volume fraction of oxygen in the air always maintain about 21%? 2. Can we draw a conclusion that nitrogen accounts for about 4 / 5 of the air from the burning experiment of red phosphorus in the bell jar? Why? 3. If there is water vapor in the air, will the content of water vapor change
17. In the article "carbon dioxide", green plants and carbon dioxide give out oxygen when they do (). Animals breathe in oxygen and exhale carbon dioxide. In this way, they keep ()
18. [chemistry] design an experiment to prove that respiration produces carbon dioxide
19. Please design a simple experiment to prove the existence of air in the mineral water bottle
20. The reason why the respiration of plants is not obvious under light is () A. Photosynthesis is strong, absorbing carbon dioxide B. respiration is not carried out under light C. photosynthesis inhibits respiration D. respiration is weakened under light