- #1
llhalsey
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Forces on a weight stack with the position of the pulleys so the weight is pulled up and the puller is moving a horizontally. Is it correct to use F=MG?
AI Thread Summary
The discussion centers on the forces acting on a weight stack when pulled horizontally, questioning the applicability of the formula F=MG. Participants agree that the force on the horizontal rope must support the weight, confirming the initial assumption. They note that when moving the weight vertically, the pulley system's mechanics must be considered for accurate calculations of work and power. The complexity arises from the need to account for the distance the rope is pulled, which is twice the distance the weight is lifted due to the pulley configuration. Overall, understanding the dynamics of the pulley system is crucial for precise calculations in this scenario.
- #2
berkeman
Admin
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llhalsey said:
Without a diagram it's hard to say for sure, but if I'm picturing it correctly, I think the answer is yes.
- #3
- #4
berkeman
Admin
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llhalsey said:
The force on the horizontal rope has to support the weight of the object, so your assumption is correct. However, if you start moving the weight up or down, the pulley system has to factor into any other calculations (work, etc.).
BTW, I've moved this thread to the Homework Help forums, where all schoolwork-type questions should be posted.
- #5
HallsofIvy
Science Advisor
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I note that there are two lines from the weight to the pulley. That means that you will have to pull the rope on the left twice the distance you lift the weight.
- #6
llhalsey
- 3
- 0
SO to calculate work = FD is it as simple as the distance the rope is pulled * mass of the wt *g. and Power would be divided by the time it takes to pull the distance or is there something specific with a pulley system that needs to be take into account?
Here is what I tried
This question was actually asked in one of our engineering entrances.
The answer was 1D.
My teachers say that we have to use μₘ/fₘ to get to this answer. I cannot understand why. I'll be really glad if you could tell me the exact definition of power (numerically) that works in all scenarios.
TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance)
My thoughts for the first case , one of them must be 12 volt while the other is 0
The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
Hello guys this is what I tried so far. I used the UTS to calculate the force it needs when the rope tears.
My idea was to make a relationship/ function that would give me the force depending on height. Yeah i couldnt find a way to solve it.
I also thought about how I could use hooks law (how it was given to me in my script) with the thought of instead of having two part of a rope id have one singular rope from the middle to the top where I could find the difference in height.
But the...
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