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Authoritative PPT Summary
"Pulley" Simple Machinery PPT Courseware
Learning objectives of this section
1. What is a pulley? What does it have to do with leverage?
2. How to distinguish fixed pulleys and movable pulleys?
3. What are the essences of fixed pulleys and movable pulleys?
4. What are the advantages of each type of pulley?
5. What is a pulley block? How does it work?
6. Can you use the pulley formula? Do you know the conditions of this formula?
7. Can you count the number of rope strands in the pulley block?
8. How are pulleys used to serve mankind in life?
Experimental results
1. Using a fixed pulley does not save effort or distance, but it can change the direction of the force.
F pull=G object L rope=h object
2. Using a movable pulley can save half the force, but it takes twice the distance and cannot change the direction of the force.
F= 1/2 G object F=1/2 (G object + G movement) L=2h
Can we use pulleys to save effort and change the direction of force?
pulley block
Although the fixed pulley can change the direction of force and make our work convenient, it cannot save labor;
Although the movable pulley can save half the force, it cannot change the direction of the force, which often makes it inconvenient to use.
So people used fixed pulleys and movable pulleys in combination, combining their respective advantages to form a pulley block.
summary
1. Fixed pulley:
(1) Usage features: It can change the direction of force without saving effort or effort; without saving distance or distance.
(2) Essence: It is an equal-arm lever.
2. Moving pulley:
(1) Usage characteristics: It can save half the force, but does not change the direction of the force; it can move twice as far.
(2) Essence: The power arm is twice the lever of the resistance arm.
3. pulley block
(1) Advantages of use: It can save effort and change the direction of force; but it cannot save both effort and distance.
(2) Formula: F = G total / n = (G object + G moving pulley) / n
(not counting pulley friction) s=nh
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