People's Education Edition Physics for Grade 8, Volume 2
People's Education Edition Ninth Grade Physics Complete Book
People's Education Edition Physics for Grade 8, Volume 1
Shanghai Science Edition Ninth Grade Physics
Shanghai Science Edition 8th Grade Physics
Lu Jiao Edition Ninth Grade Physics Volume 2
Lu Jiao Edition Ninth Grade Physics Volume 1
Beijing Normal University eighth grade physics volume one
Lu Ke Edition High School Physics Compulsory Course One
Guangdong and Shanghai Edition Ninth Grade Physics Volume 1
Beijing Normal University Ninth Grade Physics Volume 1
People's Education Press High School Physics Compulsory Course II
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
Lu Jiao edition eighth grade physics volume 1
Category | Format | Size |
---|---|---|
Beijing Normal University eighth grade physics volume 2 | pptx | 6 MB |
Description
"Pulley" Mechanical and Work PPT Courseware
think
Using a fixed pulley can change the direction of the force, but it cannot save effort; using a movable pulley can save effort, but it cannot change the direction of the force.
Then can we combine the two to form a pulley block, so that it can change the direction of force and save effort?
1. Pulley block
Exploration experiment: Explore the characteristics of pulley blocks
① Combine a fixed pulley and a movable pulley to form a pulley block. Discuss. How many combinations can you design? Draw your plan.
Analyze experimental results
Comparing experiments 1 and 2, the pulling force of the spring dynamometer when using the pulley block is 1/2 of the weight of the object.
Comparing experiments 1 and 3, the pulling force of the spring dynamometer when using the pulley block is 1/3 of the weight of the object.
summary
The magnitude of the pulling force F is related to the number n of rope segments used to lift the movable pulley. The moving pulley is hoisted by several lengths of rope, and the force used is a fraction of the weight of the object, that is:
F =1/n G
The distance s moved by the tension F (the free end of the rope) is n times the rising height h of the object, that is:
s = nh
example
1. In the pulley block shown on the right:
(a) If the weight of the movable pulley G is not included, what is the pulling force F?
F =1/5 G object
(b) If the weight of the movable pulley G cannot be ignored, what should the pulling force F in the figure be equal to?
F =1/5 (G object + G wheel)
2. As shown in the figure, the weight of object A is 100 N, and the pulling force on the hook holding the heavy object is _____ N. The force exerted by a person pulling the rope at a constant speed is _____ N (the dead weight of the movable pulley is not included).
3. Among the four pulley blocks as shown in the figure, the one in Figure ______ can save half the effort, the one in Figure ______ is the most laborious, and the one in Figure ______ and Figure ______ require the same amount of force.
4. Use the pulley set as shown in the figure to pull object A. How to wind the wire with the least effort? Draw a winding diagram.
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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:
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"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: 2024-10-26
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