- #1
OsiriS^
- 11
- 0
Hello all. I'm not sure if this is the correct forum because I'm in the UK and I don't know what "Grade K12" is, but the sort of stuff in this forum seems to be the type of work we're doing.
We've just started some work on moments and equilibrium and I'm having difficulty solving the problems. I understand the theory work, such as the principle of moments, requirements for equilibrium and so on, I just need help in understanding why certain things solve the problems. Anyway, all is revealed below
I've had help from the lecturer and so I have the answers but I'm still a little confused...well a lot actually
Here are the two questions:
http://img.photobucket.com/albums/v216/rigdon/questions.jpg
And here are my answers:
http://img.photobucket.com/albums/v216/rigdon/question5.jpg
http://img.photobucket.com/albums/v216/rigdon/question6.jpg
So, for question 5, I understand that Moment = Force x Perpendicular Distance from pivot and that 100N x 3m will give the moment of the weight acting down. But I don't understand how writing the equation 100x3 = Rx8 would allow you to solve R when we are taking points about pivot 'A'. I get it mathematically i.e obviously 100x3 = Rx8 can easily find R, but I mean the moments/equilibrium part of it.
Now for question 6. How does 500x0.4 = T Sin12 x 0.47 allow you to find T? Again I don't mean mathematically, I mean how does it logically work out that that equation can find T...
I know my questions are weird and I would be eternally grateful if someone can make me understand these moments/equilibrium problems.
Thanks in advance
We've just started some work on moments and equilibrium and I'm having difficulty solving the problems. I understand the theory work, such as the principle of moments, requirements for equilibrium and so on, I just need help in understanding why certain things solve the problems. Anyway, all is revealed below
I've had help from the lecturer and so I have the answers but I'm still a little confused...well a lot actually
Here are the two questions:
http://img.photobucket.com/albums/v216/rigdon/questions.jpg
And here are my answers:
http://img.photobucket.com/albums/v216/rigdon/question5.jpg
http://img.photobucket.com/albums/v216/rigdon/question6.jpg
So, for question 5, I understand that Moment = Force x Perpendicular Distance from pivot and that 100N x 3m will give the moment of the weight acting down. But I don't understand how writing the equation 100x3 = Rx8 would allow you to solve R when we are taking points about pivot 'A'. I get it mathematically i.e obviously 100x3 = Rx8 can easily find R, but I mean the moments/equilibrium part of it.
Now for question 6. How does 500x0.4 = T Sin12 x 0.47 allow you to find T? Again I don't mean mathematically, I mean how does it logically work out that that equation can find T...
I know my questions are weird and I would be eternally grateful if someone can make me understand these moments/equilibrium problems.
Thanks in advance