The formula of moving pulley in junior high school physics Calculation of mechanical efficiency

Mechanical efficiency = active work / total work * 100%

RELATED INFORMATIONS

1. 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
2. Junior high school physics knowledge
3. Who can summarize the junior high school physics inside about the pulley block, the lever aspect knowledge? Better be more detailed
4. Summary of all knowledge points of junior high school physics The knowledge points are clear, don't copy, summarize well,
5. 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
6. G = mg, what does the formula mean?
7. What formula is a = μ mg / M
8. The physical meaning of G = mg
9. 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
10. For the formula g = mg, G is proportional to () G is gravity, g = 9.8n/kg, M is mass
11. Pulley blocks. Formula for the number of rope segments
12. Do you have any key points? It's formulas, and some fallible knowledge
13. 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
14. When an object moves or rotates, its () and () remain unchanged
15. 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.)
16. 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
17. A construction site digs a rectangular foundation and draws it on the plan with a scale of 1:2000. The length is 6cm and the width is 4cm. What is the area of this foundation?
18. Step into the new curriculum page 120-122 emergency
19. Imagination composition
20. It is known that △ ABC ∽ a ′ B ′ C ', the difference of their perimeter is 20, and the area ratio is 4:1. The perimeter of △ ABC and △ a ′ B ′ C' can be calculated