The pulley with the position of the shaft moving along with the pulled object is called a moving pulley. The moving pulley is essentially a lever whose power arm is equal to 2 times the resistance arm. It cannot change the direction of force, but it can save half the force, but it does not save power. With pulleys can be composed of pulleys. It is a simple machine commonly used in everyday life. The following Xiao Bian will introduce you to the function and characteristics of the moving pulley. Let's take a look.
Pulley overview
In use, the pulley with which the shaft moves with the object is called a moving pulley. The moving pulley can be seen as a labor-saving lever, O is the fulcrum of the lever, and the axis of the pulley is the point of resistance. The acting force of the lifted object on the shaft is resistance, and the force of the rope on the wheel is power. When lifting a heavy object, if the ropes on both sides are parallel, the power arm is twice that of the resistance arm; when the moving pulley is balanced, the power is half of the resistance.
The function and characteristics of moving pulley
1. When the force is applied to the wheel and the shaft, the action of the moving pulley can be saved, but the direction of the force cannot be changed.
2. The self-moving pulley can save labor by itself.
3, the use of moving pulleys can save half the force and cost distance. This is because when the movable pulley is used, the hook code is suspended by two ropes. Each rope only carries a moving pulley with a hook weight. Although the use of a movable pulley saves the force, the power is moved twice as much as the height of the hook code. , which costs a distance. Can not change the direction of force. Moves as the object moves.
4, the position of the shaft with the object to be pulled together with the pulley is called moving pulley.
5. If the weight is directly hung on the pulley, the pulley will also rise together when lifting the heavy object. Such a pulley will call the pulley.
6, if people stand on the pulled object to pull the rope, the pulley relative to the ground is equivalent to the fixed pulley, and the fixed pulley is the moving pulley. Therefore, the moving pulley is defined as if the pulley is moving relative to the force. Moving pulley, otherwise fixed pulley. The moving pulley pulley is halved.
7, without taking into account the gravity of the pulley itself, using the moving pulley can save half the force, but this time can not change the direction of force, pull the rope to lift the heavy object.
Labor-saving calculation
One, F = G/2 (idealized, excluding the weight of the pulley and only one moving pulley)
Second, F = (G + G moving pulley) / 2 (taking into account the weight of the moving pulley and only one moving pulley)
Third, F = (G + G moving pulley) / n (n represents the number of ropes connected to the moving pulley, this is a pulley)
The above is a brief introduction for Xiaobian. If you want to know more related information, please continue to pay attention to Qijia Consulting. More exciting consultation, please stay tuned.
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