Summary of all knowledge points of junior high school physics The knowledge points are clear, don't copy, summarize well,

Length L: main unit: meter; measuring tool: scale; reading to the next place of the minimum scale when measuring; the unit of light year is length unit. 2. Time t: main unit: second; measuring tool: clock; stopwatch in laboratory. 1 hour = 3600 seconds, 1 second = 1000 milliseconds

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1. Junior high school physics on the rod, pulley, some knowledge of mechanical efficiency It's better to be more detailed, formula, definition of everything! And hope to add some ideas to do this kind of topic
2. G = mg, what does the formula mean?
3. What formula is a = μ mg / M
4. The physical meaning of G = mg
5. The magnitude of gravity can be expressed by the formula g = mg, (g =) g How to fill in the brackets and what do they mean What do you mean by (g =) g and this
6. For the formula g = mg, G is proportional to () G is gravity, g = 9.8n/kg, M is mass
7. Correct understanding of gravity formula g = mg To be concise... In their own words, urgent ~! ~! Chemical experts to help
8. For the formula g = mg, the correct understanding is A. An object with a mass of 1kg weighs 9.8N B. The weight of a thing is 9.8 times its mass C. The weight g is proportional to g D. The weight g is proportional to M
9. The formula of gravity calculation g = mg. G = g / m, read as (), its physical meaning is () the weight of a junior high school student is close to () The equilibrium state of an object means that the object is in the state of uniform linear motion or static state. In this state, the object is subjected to () force () =Don't ignore the supplementary questions And I seem to have copied the wrong question = = not g = g / m, because it should be g = 9.8n/kg
10. The formula of gravity g = mg, M =?
11. Who can summarize the junior high school physics inside about the pulley block, the lever aspect knowledge? Better be more detailed
12. Junior high school physics knowledge
13. How to draw the section number of the rope around the movable pulley in the pulley block More detailed Oh! Had better have schematic diagram
14. The formula of moving pulley in junior high school physics Calculation of mechanical efficiency
15. Pulley blocks. Formula for the number of rope segments
16. Do you have any key points? It's formulas, and some fallible knowledge
17. The vertices a (- 1,2), B (2,1), C (4,3) of the parallelogram ABCD are known The vertices a (- 1,2), B (2,1), C (4,3) of the parallelogram ABCD are known (1) Find the coordinates of the fourth vertex D (2) Coordinates of the intersection of diagonal lines AC and BD fast
18. When an object moves or rotates, its () and () remain unchanged
19. According to the design requirements, the distance between the transmission tower P and two towns a and B must be equal, and the distance between the transmission tower P and two expressways m and N must also be equal. Please make the location of the transmission tower P in the drawing. (ruler drawing, do not write the method, keep the trace of drawing.)
20. Mathematical problems (solving linear equation with one variable) Xiaoming's telephone number is 7 digits, the first four digits are 6798, and the last three digits are three consecutive integers from small to large, and the sum of these three digits is twice the last digit