Classical mechanics changing mass

AI Thread Summary
The discussion centers on a student seeking help with understanding changing mass in classical mechanics and creating their own equations. They express difficulty in achieving consistent results and are looking for English-language resources and tips to improve their performance, noting a recent low test score. Participants clarify the term "changing mass material" and suggest that the student provide specific examples for better assistance. A link to a Wikipedia article on variable-mass systems is shared, and the importance of using English materials is emphasized for effective communication. The student is encouraged to find English versions of their current materials or translate them for better understanding.
barak
Messages
9
Reaction score
0
hey there, i need your help, I am a student in physics and electricity engineering, and i have a bit of a problem with the changing mass materiel, well in first look he's pretty easy but i want to learn how to create my own equations and I am never getting the same result.

so ill be glad if someone have any good material to read about this subject, and if anyone have tips, learning material for Classical mechanics course ill be glad, ill just mention this test getting like 70% F ,so any tips will be great:) thank you all' and I am sorry for my lame english.:)
 
Last edited by a moderator:
Physics news on Phys.org
What courses are you taking now?

The phrase "changing mass materiel" is unfamiliar. Can you give an example of problem involving this?
 
Last edited:
For the class materials that you are talking about, if they are books then perhaps there's an English version that people here are familiar with. If it's class notes then you'll have to translate them because our forum deals strictly in English as there are many posters here from many nations contributing with English as the common ground for posts.
 
i forgot to put the link , sorry for the confusion. if i wasnt clear enough (sorry) I am looking only for english materials.
thx
 
The rope is tied into the person (the load of 200 pounds) and the rope goes up from the person to a fixed pulley and back down to his hands. He hauls the rope to suspend himself in the air. What is the mechanical advantage of the system? The person will indeed only have to lift half of his body weight (roughly 100 pounds) because he now lessened the load by that same amount. This APPEARS to be a 2:1 because he can hold himself with half the force, but my question is: is that mechanical...
Some physics textbook writer told me that Newton's first law applies only on bodies that feel no interactions at all. He said that if a body is on rest or moves in constant velocity, there is no external force acting on it. But I have heard another form of the law that says the net force acting on a body must be zero. This means there is interactions involved after all. So which one is correct?
Thread 'Beam on an inclined plane'
Hello! I have a question regarding a beam on an inclined plane. I was considering a beam resting on two supports attached to an inclined plane. I was almost sure that the lower support must be more loaded. My imagination about this problem is shown in the picture below. Here is how I wrote the condition of equilibrium forces: $$ \begin{cases} F_{g\parallel}=F_{t1}+F_{t2}, \\ F_{g\perp}=F_{r1}+F_{r2} \end{cases}. $$ On the other hand...
Back
Top