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Authoritative PPT Summary
"Pulley" Simple Machine PPT Download
Part One Content: Basic Knowledge Key Points
Knowledge point 1 Fixed pulley and movable pulley
1. In order to promote the spirit of patriotism, many schools in Hefei will hold flag-raising ceremonies on Monday. The picture shows the scene during a flag-raising ceremony at a school. The pulley installed on the top of the flagpole is a fixed pulley, and its function is to change the direction of the force.
2. Among the following figures, the moving pulley is used (C)
3. As shown in the figure, the gravity on objects A and B is 100 N, and the gravity and friction of the pulley are not counted. When force is used to lift A and B at a constant speed, the force F1 is 50N and the force F2 is 100N.
4. Figure 1 shows the experimental device to explore the "characteristics of the moving pulley during operation".
(1) During the experiment, the hook code should be pulled vertically upward to make the hook code rise at a uniform speed;
(2) The data recorded by Xiaojun is as follows. Analysis of the data shows that using the movable pulley can save labor;
Number of experiments 1 2 3
Hook code weight/N 2 4 6
Force gauge indication/N 1.1 2.1 3.1
(3) Xiaojun continued the experiment and made an image of how the ratio of pulling force to hook code weight changes with the hook code weight, as shown in Figure 2. From the analysis of the image, it can be seen that the heavier the hook code, the closer the ratio of the pulling force to the hook code weight is to 0.5 (fill in the value). From this, he reasoned: when the weight of the movable pulley is not taken into account, half the force can be saved by using the movable pulley.
Knowledge Point 2 Pulley Block
5. The following description about the pulley block is more accurate (C)
A. It definitely saves effort and can change the direction of force.
B. It must save effort, but the direction of the force cannot be changed.
C. Sometimes it can save effort and change the direction of force; sometimes it can save effort but cannot change the direction of force.
D. Using a pulley block will definitely save effort
6. For the pulley block as shown in the figure, each pulley weighs 20 N, and the rope weight and friction are not counted. Use it to lift an object weighing 100 N at a constant speed. The pulling force F used is (B)
A.50 N B.60 N C.70 N D.120 N
Pulley PPT, Part 2: Comprehensive Ability Improvement
8. As shown in the figure, the indication of the spring dynamometer is 5 N, so the pulling force F is 5 N; if the gravity and friction of the pulley are not taken into account, the object rises at a constant speed, and the weight of the object is G = 10 N.
9. As shown in the figure, the gravity of the object is 300 N, and the movable pulley weighs 20 N (excluding friction and rope weight). To make an object rise 2 m at a constant speed, the pulling force of a person is 160N, and the free end of the rope is pulled down 4m. Using this device can (optional "can" or "cannot") change the direction of the force.
10. As shown in the figure, someone lifts an object weighing 150 N at a constant speed. The free end of the rope moves 6 m in 2 s. Then the speed of the weight rising is 1 m/s. If the force of the rope is 60 N, then the moving pulley weighs 30 N (excluding rope weight and friction).
11. Place a 100 N weight on a horizontal table. Now use the device as shown in the figure to pull the object at a constant speed. The friction between the object and the table is 24 N. Ignoring the gravity of the pulley and the friction between the pulley and the rope, the horizontal pulling force F is 8 N. If the free end of the rope moves at a speed of 0.6 m/s, the object moves at a speed of 0.2 m/s.
12. As shown in the figure, object A weighs 50 N and object B weighs 30 N. Object A moves in a straight line at a constant speed to the right under the influence of object B. The pulling force of the rope on A is 10 N. If a horizontal leftward force F is added to object A to pull object A, causing object B to rise at a constant speed, then the magnitude of the pulling force F is 20 N (the weight of the pulley and the rope and the weight of the rope and the Friction between pulleys is not included).
13. As shown in the figure, a lightweight pulley block is used to pull an object weighing 200 N on the horizontal ground at a constant speed. The pulling force F is 30 N. If the friction between the rope and the pulley is not included, the friction between the object and the ground is (C)
A.30 N B.45 N
C.60 N D.300 N
14. Xiaofeng uses the device in the picture to lift an object weighing 400 N, excluding friction, rope weight and pulley weight. Which of the following statements is correct (A)
A. When the object rises at a constant speed, the pulling force of the person on the rope is 200 N
B. The person pulls the rope through 1 m, and the object also rises by 1 m.
C. Both pulleys are fixed pulleys
D. Using this device not only saves effort, but also saves distance.
Pulley PPT, part 3: Expand, explore and break through
16. Xiao Ming lives on the second floor and is renovating the house. Xiao Ming wants to use the pulley set as shown in the picture to stand on the ground and transport the decoration materials from the ground to the second floor window.
(1) Please help Xiao Ming draw the winding method of the pulley block;
(2) If the decoration material weighs 600 N, how much force does Xiao Ming need to use to transport it to the 4 m second floor window (the weight of the pulley, the weight of the rope and friction are not included)?
(3) If the actual pulling force in (2) is 350 N, how much force does Xiao Ming need to use to transport the decoration materials weighing 800 N (the weight of the rope and friction are not included)?
Keywords: Free download of PPT courseware for the second volume of eighth-grade physics published by the People's Education Press, download of pulley PPT, download of simple machine PPT, .PPT format;
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