How to calculate the friction between fixed pulley and rope
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the wild world of Sinai bumeng
Author: Mengzhai
Chapter 1: your first meeting with me
update time: 2012-7-9 16:19:33 words: 3128
What do you need, I don't know what needs me, but...
I don't like this feeling...
the bustling Jing Town, standing alone in the smoke of troubled times, even the most authoritative place, has to be controlled by the most powerful princes recently, which is why all the princes are eager to go to Luoyang
the idea of holding the emperor to order the princes has been conveyed in another continent more than 1000 years ago
"..."
today's weather is just the right wind. There is always a peaceful place in the noisy center. There is an open space outside the solemn shrine, which is inaccessible to ordinary people. Only a little girl is flying a kite quietly
if you capture the plain expression carefully, you can detect a trace of happiness
I don't know what the bondage is, but temporary relief can have such an expression
"..."
after all, the young arm still failed to grasp the strength, and the kite graally flew away
she was unwilling to pace slowly. The girl knew that such leisure time was not easy to earn, so she quickened her pace and ran to the destination< br/>“……”
after confirming the location of the kite, the girl was surprised and hesitant
a wisp of light blue long hair scattered, close to the transparent blue, languidly fell on the tree branch, so that the girl can't help but look at it
"..."
her little face was slightly red, but she did not forget to stare at the paper kite on the unknown person
it seems that she is sleeping deeply, and the girl doesn't know why she doesn't want to speak. Instead, she stands in the same place and seems to be using something
once, twice
the tree branches fell continuously on the sleeping person's face, but they didn't react much. The girl's forehead trembled slightly< br/>“……”……
I need to ask you something else
Author: huoyun
Introction:
when I was seven years old, I was walking on the side of the road, regardless of the old man's physical strength. Vaguely can remember, at that time they did not say more, just look at each other and smile, wrinkled face is completely gentle and kind.
in junior high school and senior high school, the pulley mass is ignored, so the pulling force on both sides is equal. In fact, if the pulling force on both sides T1 and T2, the pulley radius is r, and there is t1r-t2r = ja. When the pulley mass is zero, j is zero. There is T1 equal to T2
it can be seen from the experiment that if the tension direction of the rope end is inclined, the rope on both sides of the lower movable pulley will form an angle! According to the knowledge of "decomposition and synthesis of force" in high school physics, we can know that the resultant force of upward pull should be equal to the gravity of downward weight. Since the gravity of weight remains unchanged, the greater the angle, the greater the pull of the rope
however, if the pull direction of the rope end is downward, then the pull does not need to be pulled down vertically. The direction of the force can be vertical downward, oblique downward, or even horizontal upward. When pulling along these directions, the pull in the rope will not change
this is because the last time the rope pulled downward bypasses the fixed pulley, the fixed pulley is fixed, and the direction of the rest of the rope is also along the vertical direction. At this time, the tension at the end of the rope is only used to change the direction of the tension, but not the size of the tension
the upward pull is determined by the number of strands of the rope around the movable pulley! It's not determined by the number of strands around the fixed pulley! That is, the true meaning of N in the formula of pulley block must be understood thoroughly!
pull the rope with T = 100N, and the tension on the rope is 100N. Thus, the acceleration a = (T-G) / M = 40m / S ^ 2 can be obtained
= (weight of object * distance of object rising) / (pulling force * moving distance of rope)
= weight of object / (number of strands of rope * pulling force)
(if the weight of the fixed pulley, the weight of the rope and the friction are not included, the weight of the movable pulley should also be counted.) when using the pulley block to lift a heavy object, the heavy object is borne by several sections of ropes, and the pulling force is equal to a fraction of the total weight of the object and the movable pulley.
F, which is equal to the tension of the rope connecting the top, f = 1 / 2 (G + F + moving pulley gravity)
F
