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Hunan Education Edition fifth grade first volume science, Pulley Brothers PPT courseware
Part One: Pulley
pulley
A wheel with grooves on the edge that rotates around a central axis
I see
According to whether the position of the pulley moves, it is divided into two types: fixed pulley and movable pulley.
When in use, the pulley is fixed and is called a fixed pulley.
When in use, the pulley and the weight move together, which is called a pulley.
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.
So can we combine the two so that it can change the direction of force and save effort?
The fixed pulley and the movable pulley form a pulley block
Application of pulley block
Crane: The fixed pulley and the movable pulley cooperate with each other. The fixed pulley and the movable pulley are combined and assembled.
Pulley Brothers PPT, Part 2: Summary
Summary
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.
Pulley block: It saves effort and can change the direction of force.
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"Pulley Brothers" PPT:
Hunan Education Edition 5th Grade Science Volume 1, Pulley Brothers PPT, Part 1 Content: Definition A pulley that is fixed in one position and rotates without moving is called a fixed pulley, like the pulley on the top of the flagpole. What is the function of fixed pulley? Notes: 1. Pull slowly during the experiment..