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"How the Flag is Raised" Flagpole and Shadow PPT Courseware 2
Every Monday, our school holds a flag-raising ceremony. Do you know how the flag is raised to the top of the flagpole?
Do you know what's the secret on top of the flagpole?
Question: How many ways can you use a pulley to lift an object? And through observation, compare the characteristics of the pulleys you assembled?
A pulley that is fixed on a bracket and does not move up and down with the weight is called a fixed pulley.
The pulley that moves up and down with the weight during work is called a moving pulley.
1. Guess the function of the fixed pulley
A. Can change the direction of force
B. Can’t save effort
C. Can save effort
2. Guess the function of the moving pulley
A. The direction of the force cannot be changed.
B. Can save effort
C. laborious
in conclusion
Fixed pulley: It is effortless and can change the direction of force.
Moving pulley: It can save effort but cannot change the direction of force.
Fixed pulleys and movable pulleys each have their own advantages and disadvantages. Can their advantages be combined?
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For more information about the PPT courseware "How the Flagpole and Shadow Raise the National Flag", please click the ppt tag of "Flagpole and Shadow How the National Flag Raises".
"How the Flag Raised" Flagpole and Shadow PPT Courseware:
"How the National Flag is Raised" Flagpole and Shadow PPT Courseware How is the National Flag Raised? Answer: The flag is raised using the combined action of pulleys and ropes. The pulley is also a simple machine. Why does the flag rise when the rope is pulled down? Observe carefully..