Recent content by KatrineRav

Thank you very much for that feedback! I will take that into account :)

I have a few other questions to this system. I have described my ideas about the behaviour of this system. I have marked the ideas about which I am uncertain with bold :) I use this diagram to simulate a system in which a person/subject is suspended in the left side and a counterweight is...

Thanks to both of you! I will fix the inconsistency :)

Uh! I think I got it :) Does this look right? If we look at the forces applied to each object we get Using Newtons 2nd law of motion, we setup equations for acceleration of object the objects: But the tension force is unknown. To determine the tension force we use the fact that -a1=a2 and...

SOLUTION ATTEMPT Newtons 2nd law states that F=ma (eq. 1). When a force is applied to a mass m it results in an acceleration a=F/m (eq. 2). If a vertical force is applied to one of the objects in this system, acceleration of both objects will occur. Assuming the length of the rope is constant...

I got to go now - thanks for the help! I would love some suggestions for how to calculate the friction in the bearing / between the axle and the pulley :) Looking forward to looking into it tomorrow :)

My hypothesis is that it is due to errors in determining the mass of M1. I was trying to balance a huge rope sack on a small scale. I supported that sack while it was weighed and I might have lifted it slightly. It is also possible that some of the sack was standing on the floor and therefore...

Can I apply this formula to this situation? I guess the normal force (F_N on my drawing) in this situation would be F_N=mg+Mg But I guess this only applies to the friction between the rope and the pulley. I can't see how to calculate the friction between the axle and the pulley. But I guess...

No, unfortunately not. I took down the test setup and I don't have access to the pulleys. This test is a part of a much bigger setup. I just did the test to try to quantify the friction, but it's all right if I'm not able to do that. It's not the main objective of my project :)

Unfortunately I did not try to rotate them by hand!

I guess the trendline with the best fit would be a parabola, so a 2nd order polynomial. But right now I'm inclined to completely disregard my data set, since my measurements are properly very inaccurate and only contains very few data points. I think I would rather look at it from a theoretical...

What friction model would you suggest? How would you calculate it? I'm all right with the data not fitting the model. They are probably pretty inaccurate. It was pretty difficult to find the exact point where the system started moving :)

Hi! I'm working in a new area and I'm looking for inputs/suggestions for relevant factors to look into and possible ressource where I can read about this :) I did some tests in a pulley similar to the one below. I had a fixed weight at M2. I started with M1=M2 but added weights to M1 until...