Fifth Grade Science Volume 1, Textbook Edition
Science Edition for Sixth Grade Science Volume 2
Third Grade Science Volume 2, Textbook Edition
Science Edition for Sixth Grade Science Volume 1
Third Grade Science Volume 1, Textbook Edition
Fourth Grade Science Volume 2, Textbook Edition
Fourth Grade Science Volume 1, Textbook Edition
Qingdao Edition Fourth Grade Science Volume 2
Hunan Education Edition Fourth Grade Science Volume 1
E-education edition fifth grade science volume 2
E-education edition fifth grade science volume 1
Fourth-grade science volume 2 of the E-education edition
Qingdao Edition Fifth Grade Science Volume 2
Fifth Grade Science Volume 2, Textbook Edition
Zhejiang Education Edition Seventh Grade Science Volume 2
Hunan Education Edition Fifth Grade Science Volume 2
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Category | Format | Size |
---|---|---|
Qingdao Edition Fifth Grade Science Volume 1 | pptx | 6 MB |
Description
"Pulley" PPT courseware
Part One: Knowledge Import and Experiment
Students, every Monday morning, we have to hold a flag-raising ceremony, so do you know how the national flag is raised to the top of the flagpole? What device is on the top of the flagpole?
There are many types of pulleys, the most basic two are:
(1) A pulley that is fixed in one place and cannot move is called a "fixed pulley".
(2) The pulley that moves with the heavy object is called a "moving pulley".
Experiment: Investigate the Effect of Pulleys
1. First determine whether you are using a fixed pulley or a movable pulley.
2. When using a pulley to lift a heavy object, in which direction is the force applied?
3. First use a dynamometer to lift the heavy object vertically and record the force; then measure the force when using the fixed pulley and the movable pulley respectively, and record them. You can do more experiments several times to reduce the experimental error.
Part Two: Thinking Questions
1: The advantage of using a fixed pulley is ______.
2: The advantage of using a movable pulley is ___.
Can we use the advantages of fixed pulleys and movable pulleys to combine them to make them labor-saving and convenient?
able. Combine them into a pulley block.
Think about it?
Where are pulleys used in life? What are the characteristics of these pulleys? What role did each play?
Part Three: Application of Pulleys
pole game
1. As shown in the picture in the textbook, three students work together to tie one end of the rope to a long pole not far from the middle, and wrap the rope around the two long poles as shown in the picture. The two students hold a rope respectively. Tighten a long pole and prepare to pull it out forcefully.
2. The third student holds the other end of the rope.
Thinking: Can one student pull together two long poles that two students are pulling outwards by pulling the rope?
3. Without using a rope, another student uses two hands to pull the two bamboo poles directly to see if they can pull the two bamboo poles together.
4. Wrap the rope around the bamboo pole a few more times and then pull the rope. What will be the result?
Think: What’s the secret?
Part 4: Expansion activities
Can we use the advantages of fixed pulleys and movable pulleys to combine them, so that they are labor-saving and convenient to use?
Observe what is the difference between wheels and pulleys in life?
Keywords: Qingdao version fifth grade science PPT courseware free download, pulley PPT download, .PPT format;
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File Info
Update Time: 2024-09-12
This template belongs to science courseware Qingdao Edition Fifth Grade Science Volume 1 industry PPT template
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