People's Education Edition Physics for Grade 8, Volume 2
People's Education Edition Ninth Grade Physics Complete Book
Shanghai Science Edition Ninth Grade Physics
People's Education Edition Physics for Grade 8, Volume 1
Shanghai Science Edition 8th Grade Physics
Beijing Normal University eighth grade physics volume one
Lu Jiao Edition Ninth Grade Physics Volume 1
Beijing Normal University Ninth Grade Physics Volume 1
Lu Jiao Edition Ninth Grade Physics Volume 2
Guangdong and Shanghai Edition Ninth Grade Physics Volume 1
Lu Ke Edition High School Physics Compulsory Course One
People's Education Press High School Physics Compulsory Course II
Guangdong and Shanghai version of eighth grade physics volume 2
Beijing Normal University Ninth Grade Physics Volume 2
Lu Jiao Edition Eighth Grade Physics Volume 2
Guangdong and Shanghai Edition Ninth Grade Physics Volume 2
!["Pulley" Mechanical and Work PPT Courseware 4](http://daogebangong.oss-cn-beijing.aliyuncs.com/ppt/preview/1/7510d934-de69-4adf-bf28-958b03c1a0e0.webp)
Category | Format | Size |
---|---|---|
Beijing Normal University eighth grade physics volume 2 | pptx | 6 MB |
Description
"Pulley" Mechanical and Work PPT Courseware 4
Pre-study tips
Do you know about pulleys? Talk about the pulleys you have seen.
______________ is called a fixed pulley.
_______________ Call the pulley.
Think about it, where are pulleys used in life?
How do you recognize pulleys? What does the pulley do?
We pull down on the rope and the flag rises. Do you know what's on the top of the flagpole?
Definition: A pulley that does not move with the object is called a fixed pulley.
Question: What are the benefits of using fixed pulleys?
Characteristics of fixed pulley
Using a fixed pulley is not labor-saving, but it can change the direction of the power (explain the change in the direction of the power).
Definition: A pulley that moves with an object is called a toggle pulley
Experimental inquiry: What are the benefits of using a moving pulley?
Features of moving pulley:
Using a movable pulley can save half the effort, but it takes twice the distance and cannot change the direction of the pulling force.
A pulley block is composed of a fixed pulley and a movable pulley."
Question: What are the advantages of using pulley blocks?
The characteristics of the pulley block: it can save labor and change the direction of the force. When using the pulley block, the pulley block uses several ropes to hang the object, and the force used to lift the object is a fraction of the weight of the object.
Class summary
What did you learn from this class? What are the gains?
Classroom testing
(1) If the weight in the picture is 20N and the center of the movable pulley is 4N, please calculate the pulling force F in the picture.
(2) Please draw the correct winding method in the pulley block in the figure below so that the pulling force is one-half and one-third of the weight of the object respectively.
(3) As shown in the figure, a worker uses force F to move an object A weighing 800N 6m in the horizontal direction at a constant speed. It is known that the friction between A and the ground is 0.25 times the gravity, excluding the weight of the pulley and friction. Here In the process, the size of this F is ____.
(4) Please design a pulley block using two fixed pulleys and one movable pulley to lift a 3000N weight. The rope weight and friction are not taken into account. Calculate the magnitude of the pulling force F.
(5) A rope can only withstand a force of 5000N. If it is used to lift a weight of 16000Nd, what kind of pulley should be selected? Draw the winding method.
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For more information about the "Pulley Machinery and Work" PPT courseware, please click on the "Pulley PPT Machinery and Work PPT" tab.
Five PPT charts of the relationships between pulley block designs:
This is a PPT chart of the relationship between five pulley block designs, in .PPTX format;..
"Pulley Block" Tools and Machinery PPT teaching courseware:
"Pulley Block" Tools and Machinery PPT Teaching Courseware Part One: Introduction of New Lessons Whether in cities or in rural areas, there are many construction sites. What did you find when visiting these busy construction sites? Know how a crane delivers heavy objects to...
"Pulley Block" Tools and Machinery PPT download:
"Pulley Block" Tools and Machinery PPT Download Part One: New Lesson Exploration (1) Observing the pulleys on the crane Crane refers to a multi-action hoisting machine that lifts vertically and carries heavy objects horizontally within a certain range. Thinking: How does a crane lift such a heavy building...
File Info
Update Time: 2024-09-11
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