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"Exploring the Function of Pulleys" Force and Machinery PPT Courseware 2
Fixed and movable pulleys
When raising the flag, stand at the bottom of the flagpole and pull the rope downwards, and the flag will slowly rise. It turns out that there is a small wheel with a grooved edge fixed to the top of the flagpole - a fixed pulley.
Do you know of any other places where pulleys like this are used?
A pulley whose position is fixed when used is called a fixed pulley.
When the pulley is in use, it is divided into fixed pulley and movable pulley according to whether the position of the shaft moves.
When in use, the shaft is fixed and is called a fixed pulley.
When in use, the shaft and the weight move together, called the pulley.
The essence of fixed pulley
The essence of a fixed pulley: a lever whose power arm is equal to the resistance arm
The magnitude of the pulling force is always equal to the magnitude of the weight's gravity. F＝G
The essence of the moving pulley:
The power arm is twice the lever as the resistance arm
When the movable pulley is balanced, the relationship between the pulling force F and the gravity G is: F=1/2G
practise
1. Using the _____ pulley cannot save effort, but it can change ___________; using the ____ pulley can save half the effort.
2. From the perspective of the relationship between the lever arm lengths, the fixed pulley is actually a _________ lever, while the movable pulley is a _________ lever.
3: As shown in the figure (a) below, object B weighs 100N. When it rises at a constant speed under the action of force F, F should be equal to ____N. (excluding friction)
4. As shown in the figure, the object weighs G=50N and the pulley weighs 10N. When the object G rises at a constant speed, the pulling force on hook B is ________N, and the pulling force on hook A is ________N. The pulling force F is _____N. If the rope is free If the end is pulled upward by 0.5 meters, the object will move upward by ______ meters.
Assembly of pulley block (i.e. winding method)
Assembly method: First determine the labor-saving condition of the pulley block, that is, the number of rope segments n, and then wind it.
The formula: "odd moving, even fixed", that is, the odd-numbered rope sections start winding from the movable pulley, and the even-numbered rope sections start winding from the fixed pulley.
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"Exploring the Function of Pulleys" Force and Machinery PPT Courseware 3:
"Exploring the Function of Pulleys" Force and Machinery PPT Courseware 3 1. Learning Objectives 1. What is a fixed pulley? What is the use of fixed pulleys? What are the characteristics? 2.What is a moving pulley? What is the function of using a movable pulley? What are its characteristics? 3. What is a pulley block? Use the pulley..
"Exploring the Function of Pulleys" Force and Machinery PPT Courseware:
"Exploring the Function of Pulleys" Force and Machinery PPT Courseware Teaching Objectives 1. What is a fixed pulley and what is a movable pulley 2. The benefits of fixed pulleys and the benefits of movable pulleys 3. Theoretical analysis of pulleys will be carried out based on the balance conditions of levers 4. In the pulley group The relationship between tension and gravity...