wow! you are freaken amazing!! my professor makes it sooo hard and complicated.. but you explained it soo clearly..thanks a lot!!!! you might just be the reason why i pass this class..wish i would have found your vids at the beginning of the semester.. thanks for the upload
Thanks for the note. It actually depends on which convention you are using. Some systems teach CCW as positive, others teach CW as positive. As long as you are consistent throughout the problem, and that you are consistent with your answer, it doesn’t matter which convention you use! :)
Really nice presentation. Assume he's testing you with Sine 90 degrees is O; stay on your toes. and keep an open mind when instructor introduces new conventions that are logically consistent. Participate when you listen. This was very helpful.
Jorge Cardona sin of 90 is 1. sin of pi/2 is also 1. Note that I wrote it correctly, I just misspoke. A common error when one is at the board teaching... :)
+thePortsMass Mass True, that is the normal convention. But a convention is just that, a convention. An agreed-upon method of solving a problem. As I've mentioned in several comments, the convention can be reversed and it works just fine, gives the same answer! Be familiar with the convention that your examiners use, but be open to new ideas and concepts!
As stated before, it does not matter, as long as you are consistent. If you look at the picture from the front side, you may call counterclockwise positive, but if you look at it from the back side, it goes the "opposite" direction, meaning that it's now negative... It doesn't really matter as long as you are consistent with your convention!
No problem at all! 9.81 m/s^2 is the acceleration due to gravity. If you are calculating the force of gravity on an object, you multiply its mass by 9.81. About the sin 90, are you talking about where it went for Torque 1 in the first problem? Sorry, I'm not quite sure what you are referring to. sin 90 = 1, so when you multiply by it, the value doesn't change. Please clarify if this isn't helpful!
@@claudiacroce-tashman4559 Hi, thanks for your comments. you are correct, I said sin 90 is 0, but in the problem I actually made it 1. I misspoke there, but did the math correctly. As to the +/-, making clockwise negative is a convention. That means we normally do it that way, but as long as you define how you will do it, it doesn't actually matter. It is like x and y axes being horizontal and vertical are a convention, but when an object is sliding down a ramp, we will tilt the axes so the x-axis is parallel to the slope. It is a convention. As long as you define how you will use it and use it consistently, it doesn't matter! Sometimes it is valuable to be able to look at a problem from a different perspective, which is what I do here!
@@claudiacroce-tashman4559 Very welcome. Depending on your teacher, you may want to just stick to your original convention of counter-clockwise being positive. I try to get my students to think outside the box and consider other possibilities, but to be honest, some teachers are a little less flexible. Stick to what makes your grader happy! :)
Can you redo a video with how you can use the right hand rule to show the direction of the torque? Don't redo the whole problem, just show how to get the direction. Please and thank you.
Please read the comment below. +/- is just a convention. It really doesn't matter which one you do, as long as you are consistent and communicate your process! It's all a matter of perspective. If you look from the other side's perspective, you will see what looks clockwise to one person is counter clockwise for another! Though you are correct, the normal convention matches that in math, which is that we like to treat clockwise as negative.
sin(30) = sin(150). All obtuse angles can be simplified to the reference angle if you know how to use it and if you pay attention to the signs. In this case, they are both positive, and both have exactly the same magnitude. Therefore, it is acceptable to use the reference angle. You are correct that sin(150) would also work.
Thanks to all for your comments! Yes, sin90 is 1. I worked it correctly but stated it incorrectly. Sorry about that! Also, +/- clockwise or anti- does not matter as long as you define it and are consistent! Anyone that says otherwise does not have very good spatial reasoning, because any situation you can view from 180 degrees and it will give you exactly the same results with the opposite convention! :) What a mind opener!
Excellent video. I loved how you went step-by-step and made it very easy to understand. Thanks a lot!
wow! you are freaken amazing!! my professor makes it sooo hard and complicated.. but you explained it soo clearly..thanks a lot!!!! you might just be the reason why i pass this class..wish i would have found your vids at the beginning of the semester.. thanks for the upload
Thanks for the note. It actually depends on which convention you are using. Some systems teach CCW as positive, others teach CW as positive. As long as you are consistent throughout the problem, and that you are consistent with your answer, it doesn’t matter which convention you use! :)
That's some OG windows os. mad respect bruv
Really nice presentation. Assume he's testing you with Sine 90 degrees is O; stay on your toes. and keep an open mind when instructor introduces new conventions that are logically consistent. Participate when you listen. This was very helpful.
sin of 90 is actually = 1 or pi/2
Jorge Cardona sin of 90 is 1. sin of pi/2 is also 1. Note that I wrote it correctly, I just misspoke. A common error when one is at the board teaching... :)
I can only imagine. (;
positive torque is whichever way you're setting your angular acceleration. as long as you're consistent throughout the problem.
Clockwise is negative and the Counter Clockwise is Positve
+thePortsMass Mass True, that is the normal convention. But a convention is just that, a convention. An agreed-upon method of solving a problem. As I've mentioned in several comments, the convention can be reversed and it works just fine, gives the same answer! Be familiar with the convention that your examiners use, but be open to new ideas and concepts!
What website/application did you use for the calculator? Thanks for explaining equations using negative and positive torque. This video was helpful.
It is just the TI-84 smartview. I'm a teacher so it came with a class set I had purchased.
As stated before, it does not matter, as long as you are consistent. If you look at the picture from the front side, you may call counterclockwise positive, but if you look at it from the back side, it goes the "opposite" direction, meaning that it's now negative... It doesn't really matter as long as you are consistent with your convention!
Thanks for the video you are a very good teacher, very clear work through Thanks!
@aaron tuazon The mass is 0.5 kg, not 5kg. That's why I get 1.47 for an intermediate step on Q#2.
Positive torque is counter-clockwise and Negative torque is clockwise
sorry for interrupt, 9.81 is refer to what ? why don't you use sin 90 ? can you explain it :D , tq
No problem at all! 9.81 m/s^2 is the acceleration due to gravity. If you are calculating the force of gravity on an object, you multiply its mass by 9.81. About the sin 90, are you talking about where it went for Torque 1 in the first problem? Sorry, I'm not quite sure what you are referring to. sin 90 = 1, so when you multiply by it, the value doesn't change. Please clarify if this isn't helpful!
I found this video most helpful. Thanks.
@Gutsyndicate torque is circular, it doesn't have multiple directions
sin90 is 1 thats why your torque 2 stand correct.
If sin90 was 0 your torque 2 would have been 0.
Just a minor mistake at 2:13 minutes in.
correct me if i am wrong but
shouldn't clockwise rotation is negative and
anticlockwise is positive 1:00
why did you assume that the force of the meter stick ( in 2nd Q ) is going down or negative ?
sin of 90 degrees is 1 not 0 and counter clockwise is positive not negative. I am confused by the video on torque
@@claudiacroce-tashman4559 Hi, thanks for your comments. you are correct, I said sin 90 is 0, but in the problem I actually made it 1. I misspoke there, but did the math correctly. As to the +/-, making clockwise negative is a convention. That means we normally do it that way, but as long as you define how you will do it, it doesn't actually matter. It is like x and y axes being horizontal and vertical are a convention, but when an object is sliding down a ramp, we will tilt the axes so the x-axis is parallel to the slope. It is a convention. As long as you define how you will use it and use it consistently, it doesn't matter! Sometimes it is valuable to be able to look at a problem from a different perspective, which is what I do here!
@@MrBdubsSAS thanks for clarifying
@@claudiacroce-tashman4559 Very welcome. Depending on your teacher, you may want to just stick to your original convention of counter-clockwise being positive. I try to get my students to think outside the box and consider other possibilities, but to be honest, some teachers are a little less flexible. Stick to what makes your grader happy! :)
Can you redo a video with how you can use the right hand rule to show the direction of the torque? Don't redo the whole problem, just show how to get the direction. Please and thank you.
Don't you also include the mass of the stick 0.15 kg into the equation.
Torque in anti clockwise should be positive.
Please read the comment below. +/- is just a convention. It really doesn't matter which one you do, as long as you are consistent and communicate your process! It's all a matter of perspective. If you look from the other side's perspective, you will see what looks clockwise to one person is counter clockwise for another! Though you are correct, the normal convention matches that in math, which is that we like to treat clockwise as negative.
your calculation for torque 3 is wrong, the angle is 150 not 30
sin(30) = sin(150). All obtuse angles can be simplified to the reference angle if you know how to use it and if you pay attention to the signs. In this case, they are both positive, and both have exactly the same magnitude. Therefore, it is acceptable to use the reference angle. You are correct that sin(150) would also work.
Mr Bdubs Math and Physics Omg you are right thanks dude, fucking physics teacher trying to complecate everything
very clear information.. thank you!
why my professor got 80 N? and not 6N?
On this question? Not sure, perhaps if you want to let me know how your professor worked it out I can help you on that one.
Thanks to all for your comments! Yes, sin90 is 1. I worked it correctly but stated it incorrectly. Sorry about that! Also, +/- clockwise or anti- does not matter as long as you define it and are consistent! Anyone that says otherwise does not have very good spatial reasoning, because any situation you can view from 180 degrees and it will give you exactly the same results with the opposite convention! :) What a mind opener!
Well it does, if you are math geek ccw is positive.
Damn, how old is your Windows? Look at that start button! Lol but good content!
Haha, well, I made the video about 9 years ago... :) glad you found it helpful.
Thank you! :)
★ sin(90)=1
SINE90 IS ONE
thx a lot it helps
no sin90 is 1
2×5o=100 , not 10
Hi Maha, that is true, but 0.2*50 = 10 :)
thnx
thank u, its very helpful~
Miley Cyrus Favorite Lesson XD
Please read my response again...
windows -10000