My AP Physics teacher is a wonderful teacher but he tends to not elaborate fully on concepts. You good sir have certainly made this a bit easier to understand.
Hello Dan, First of all thanks for all the efforts given in making these videos!! I would like to say that your channel is the best channel among many ones which i have visited so far! You have great understanding to physics and you adress this subject in a very clear systematic way! In addition to that you have offered your great knowledge in this material free of charge! This is the least that i can say on your determination and ethics towards teaching and physics! You have my respect and support!! Saleh
Thank you for this! (9 years after upload lol) My AP Physics 1 teacher is one of the worst teachers I've ever had, she can't explain anything for her life. I have my unit test tomorrow, and this is the first time I understand atwood machines. And unlike AP classroom videos, this gets to the point and actually teaches instead of ranting on for 10 minutes about how they are going to design some "physics experiment"
very helpful..im gonna continue learning from your videos... thank you Mr. Fullerton ..btw am not from US, so no high school.. but this knowledge is very helpful..
Any reason why you would have the heavier object point in the positive direction? That seems very counterintuitive since that one's gonna be driver. So it would make more sense to say that should be the negative force.
@@DanFullerton I tried doing it my way instead and it yields the same result in the end so it all depends on rigging the coordinate system properly. Thanks for the video.
I tried to apply the Atwood Machine in the field at my job. I have to carry my 50 pound backpack up and down a 175' tower. So I thought to create an Atwood Machine using a 200' rope, two pulleys, my backpack(M1) and some weights(M2). The objective was to establish equilibrium so that I could easily take my backpack up and down the tower with little to no effort. My atwood machine failed miserably. I was able to raise my backpack (lowering the weights) with very little effort. But lowering my backpack (raising the weights) took a tremendous amount of effort - there had to have been at least 25lbs of resistance when lowering my backpack. I'm baffled in how it worked one way but not the other.
Keep in mind that these problems all involve ideal pulleys (no rotational inertia) and no friction. In reality, pulleys have mass and ropes have friction, which need to be modeled in more detail for most practical applications.
for net force equations, do we always put the positive direction minus the negative direction? after we decided what way is positive and what is negative that is...
no matter what I do I'm getting accel. = (-m1 + m2)g/m1 + m2. It appears to work but every book and video has it (m1 - m2)g/m1 + m2. Are you considering accel. to be negative?
It just depends on which direction you define as positive. A negative acceleration to the left, for example, is equivalent to a positive acceleration to the right on a linear axis. I'd look at the direction you're calling positive and see if that aligns with whatever book you're referencing.
My AP Physics teacher is a wonderful teacher but he tends to not elaborate fully on concepts.
You good sir have certainly made this a bit easier to understand.
Not all heroes wear capes. Actually most of them are probably educators.
Thanks Brother! - From Canada
You rock, thank you!
So THAT's what all those problems about massless pulleys with blocks hanging off them are called! Thank you!
Hello Dan,
First of all thanks for all the efforts given in making these videos!!
I would like to say that your channel is the best channel among many ones which i have visited so far! You have great understanding to physics and you adress this subject in a very clear systematic way! In addition to that you have offered your great knowledge in this material free of charge! This is the least that i can say on your determination and ethics towards teaching and physics! You have my respect and support!!
Saleh
Thank you for this! (9 years after upload lol)
My AP Physics 1 teacher is one of the worst teachers I've ever had, she can't explain anything for her life. I have my unit test tomorrow, and this is the first time I understand atwood machines. And unlike AP classroom videos, this gets to the point and actually teaches instead of ranting on for 10 minutes about how they are going to design some "physics experiment"
FR
Thrilled to hear it Katrina! Have a great fall... can't wait to hear how your physics course goes!
very helpful..im gonna continue learning from your videos... thank you Mr. Fullerton ..btw am not from US, so no high school.. but this knowledge is very helpful..
this made so much sense
Very nice, concise and straight forward presentation
Thank you
Glad you're finding this useful!
Mr. Fullerton,
This helped a lot with my physics lab.
-Katrina Rojas
Can we be friends am from Zambia whatsap line +260972619060
Oh thats what i wanted thanks
Frm pakistan
Subscribed
This is 10 years old but its still helpful. thanks
At 3:09, what is the net force conceptually? Is that the force exerted by the block on the pulley?
Thrilled to hear they're helping, and so sorry I'm a day late... doing my best to keep up with my AP-C class this year. Best of luck this year!
it was the best explanation!
Any reason why you would have the heavier object point in the positive direction? That seems very counterintuitive since that one's gonna be driver. So it would make more sense to say that should be the negative force.
Yes, that implies at first glance that you'll have a positive acceleration. I like working with positive numbers better than negative.
@@DanFullerton I tried doing it my way instead and it yields the same result in the end so it all depends on rigging the coordinate system properly. Thanks for the video.
You're welcome! -- from USA :-)
How is tension constant throughout the string if it is in the positive direction on one side and in the negative direction on the other side?
I tried to apply the Atwood Machine in the field at my job. I have to carry my 50 pound backpack up and down a 175' tower. So I thought to create an Atwood Machine using a 200' rope, two pulleys, my backpack(M1) and some weights(M2). The objective was to establish equilibrium so that I could easily take my backpack up and down the tower with little to no effort. My atwood machine failed miserably. I was able to raise my backpack (lowering the weights) with very little effort. But lowering my backpack (raising the weights) took a tremendous amount of effort - there had to have been at least 25lbs of resistance when lowering my backpack. I'm baffled in how it worked one way but not the other.
Keep in mind that these problems all involve ideal pulleys (no rotational inertia) and no friction. In reality, pulleys have mass and ropes have friction, which need to be modeled in more detail for most practical applications.
2024 attendents 😂
Lol
Yes
Thank you Sir,
- from Norway
awesome video thank you!
You're welcome!
This video is still being assigned in physics classes today.
Oh the poor students... ;-). Hope you found it helpful!
You're welcome.
for net force equations, do we always put the positive direction minus the negative direction? after we decided what way is positive and what is negative that is...
Due to the commutative property, you'll get the same answer either way. Try it! :-)
no matter what I do I'm getting accel. = (-m1 + m2)g/m1 + m2. It appears to work but every book and video has it (m1 - m2)g/m1 + m2. Are you considering accel. to be negative?
It just depends on which direction you define as positive. A negative acceleration to the left, for example, is equivalent to a positive acceleration to the right on a linear axis. I'd look at the direction you're calling positive and see if that aligns with whatever book you're referencing.
ily tysm
if der is friction,wher has to b d coefficient f friction put?
Thank you so much!!!
thank you!
Mraz Burgs
equations with more letters (that have no numbers) confuse me so bad 😭