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How to draw physical lever diagram
Five elements should be paid attention to in the schematic diagram of the lever. ① fulcrum: the point around which the lever rotates. It is indicated by the letter o. ② power: the force that makes the lever rotate. It is indicated by the letter F1. ③ resistance: the force that prevents the lever from rotating. It is indicated by the letter F2
How to use the lever principle of tweezers? How to draw the schematic diagram of its power and resistance? Also, which direction is the schematic diagram of the power of pulling nails with a hammer?
The fulcrum of the tweezers is the intersection of the two arms at the last end. The hand exerts power downward, and the object being clamped exerts resistance upward. You can have a more intuitive understanding by yourself. The direction of the hand moving the hammer is the direction of the power (you mean the claw hammer?). The lever in this picture is actually a broken line, not a straight stick, so there is no opposite problem, Power and resistance as long as the lever does not turn in one direction on the line (this is very important to learn leverage) understand?
RELATED INFORMATIONS
- 1. Schematic diagram of forceps force lever Why is forceps a hard lever? Why is the fulcrum the top? Please help draw the diagram of the forced lever and explain it in detail
- 2. Solving the labor saving principle of moving pulley
- 3. Please explain the working principle of the movable pulley
- 4. Using the lever theorem, Give you a pen, a meter ruler, and some 50g weights to calculate the mass of the ruler
- 5. Archimedes's famous saying, as long as we give him a fulcrum on the earth, he can pry up the earth. What's the reason
- 6. Archimedes, a famous ancient Greek scholar, once said, "if you give me a lever and a fulcrum, I can pry the earth." Now let's make a hypothesis that C is the fulcrum, and the lever can rotate around C. We put the earth at point B. if the ratio of the power arm AC and the resistance arm BC of the lever is 5:1, and we want to lift the earth up 10 cm, how many m should we press the A end of the lever down?
- 7. When to use Archimedes theorem to calculate
- 8. Where is the insulating paint scraped away from the resistance wire on the rheostat? Why?
- 9. 1000 ohm = - megaohm, the structure of sliding rheostat -, -, -, -, -, -
- 10. How to judge whether sliding rheostat is current limiting connection or partial compression connection
- 11. Push up is a common basic exercise. Xiaoming weighs 600N. He does 30 push ups in 1min. Every time he does it, his shoulder rises 50cm. Xiaoming's body is a lever, and O is a key If the area of each palm is 0.016 M & sup2;, calculate the pressure of both hands on the ground and the work done by Xiaoming in 3.1 Min. 4
- 12. Why is Archimedes's lever principle the same type of shovel, what is the shovel?
- 13. Briefly talk about the similarities and differences of the use of lever principle between pliers and guillotine
- 14. Hang two groups of hook codes on both sides of the lever, adjust the number of hook codes or the position on the lever, so that the lever is balanced in the horizontal position. What is the purpose? Record___ 、___ 、____ 、______ Then hang a group of hook codes on the same side of the spring dynamometer, and the spring dynamometer should be pulled vertically upward for the purpose of? In use__________ The fixed pulley is called the fixed pulley_____ But you can____________ And change the direction of tension
- 15. 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----
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- 17. 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 ()
- 18. What kind of lever is the balance? What principle does it use?
- 19. Why should the balance beam be made equal arm
- 20. What factors are related to the mechanical efficiency of leverage