Err, no. That's allowed. Those problems are called net force problems.Scio5ever wrote:Essentially, yes, anything that involves calculating forces and whatnot related to bodies in motion is not allowed. At least that's my interpretation of the rules.Unome wrote:I was never quite sure what dynamic calculations were; is it just anything not in static equilibrium?jkang wrote:"Prohibited topics include: dynamic calculations"
Idk why everyone's trying so hard on that problem when it's never going to come up at nationals or anything .__.
Simple Machines B/Compound Machines C
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Re: Simple Machines B/Compound Machines C
Old fart who sort of did things sort of for some schools.
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Re: Simple Machines B/Compound Machines C
I would think so; the opposite of dynamic calculations should be static calculations, which would be anything in equilibrium. However I find it hard to believe that some basic dynamic calculations won't be included, for example the acceleration of masses on a fixed pulley would be something I would expect to come across at Nationals.Unome wrote:I was never quite sure what dynamic calculations were; is it just anything not in static equilibrium?jkang wrote:"Prohibited topics include: dynamic calculations"
Idk why everyone's trying so hard on that problem when it's never going to come up at nationals or anything .__.
Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it. - Niels Bohr
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Re: Simple Machines B/Compound Machines C
Of course, you can ask questions about forces... it's just that has to equal zero.RontgensWallaby wrote:I would think so; the opposite of dynamic calculations should be static calculations, which would be anything in equilibrium. However I find it hard to believe that some basic dynamic calculations won't be included, for example the acceleration of masses on a fixed pulley would be something I would expect to come across at Nationals.Unome wrote:I was never quite sure what dynamic calculations were; is it just anything not in static equilibrium?jkang wrote:"Prohibited topics include: dynamic calculations"
Idk why everyone's trying so hard on that problem when it's never going to come up at nationals or anything .__.
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Re: Simple Machines B/Compound Machines C
http://img.sparknotes.com/content/testp ... pulley.gif
A problem I just came up with. Solved it and just want to make sure I'm right since I doubt my coach will know how to solve it (it's not that complicated).
In the diagram from the link, angle θ is 37 degrees and mass m is 15 kg. The coefficient of friction between mass m and the inclined plane is 0.4. Assume the pulley is frictionless. What are the maximum and minimum masses for mass M if the system is in equilibrium?
A problem I just came up with. Solved it and just want to make sure I'm right since I doubt my coach will know how to solve it (it's not that complicated).
In the diagram from the link, angle θ is 37 degrees and mass m is 15 kg. The coefficient of friction between mass m and the inclined plane is 0.4. Assume the pulley is frictionless. What are the maximum and minimum masses for mass M if the system is in equilibrium?
Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it. - Niels Bohr
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Re: Simple Machines B/Compound Machines C
I got 4.235 kg <= M <= 13.82 kg? Got 4.235 kg by assuming left side was heavy, 13.82 by assuming right. With sig figs (mu only has one), 4 kg and 10 kg.RontgensWallaby wrote:http://img.sparknotes.com/content/testp ... pulley.gif
A problem I just came up with. Solved it and just want to make sure I'm right since I doubt my coach will know how to solve it (it's not that complicated).
In the diagram from the link, angle θ is 37 degrees and mass m is 15 kg. The coefficient of friction between mass m and the inclined plane is 0.4. Assume the pulley is frictionless. What are the maximum and minimum masses for mass M if the system is in equilibrium?
UT Austin '19
Liberal Arts and Science Academy '15
Liberal Arts and Science Academy '15
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Re: Simple Machines B/Compound Machines C
Ok, that's what I got.
(originally I solved incorrectly for the minimum mass and used the total weight of the block as the force it exerted, for some reason)
(originally I solved incorrectly for the minimum mass and used the total weight of the block as the force it exerted, for some reason)
Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it. - Niels Bohr
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Re: Simple Machines B/Compound Machines C
The only other thing was that my minimum mass was 4 grams heavier than yours but that shouldn't be an issue. Probably a result of different intermediate rounding.
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Re: Simple Machines B/Compound Machines C
Just want to make sure you know you don't have to know this. Div B prohibited topics include coefficient of friction.RontgensWallaby wrote:http://img.sparknotes.com/content/testp ... pulley.gif
A problem I just came up with. Solved it and just want to make sure I'm right since I doubt my coach will know how to solve it (it's not that complicated).
In the diagram from the link, angle θ is 37 degrees and mass m is 15 kg. The coefficient of friction between mass m and the inclined plane is 0.4. Assume the pulley is frictionless. What are the maximum and minimum masses for mass M if the system is in equilibrium?
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Re: Simple Machines B/Compound Machines C
Okay, so as far as I can tell, if the following system is in static equilibrium, the downward force on the fulcrum would be 16.82; I just wanted to check here and see if that makes sense:
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Re: Simple Machines B/Compound Machines C
Strange... I got an upward force of 16.82 N (with sig figs that's 20 N).Unome wrote:Okay, so as far as I can tell, if the following system is in static equilibrium, the downward force on the fulcrum would be 16.82; I just wanted to check here and see if that makes sense:
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