actually if we move the mass perpendicular to the displacement vector the work equals to zero but you said in addition to this if we move the mass to the right so in this case the force vector is not just up component so there is an angle that is not equal to 90 degrees. Į couldnt understand this please if you explain i will be a very happy man.
He explained it towards the end, since he's moving the box slowly he's not changing the kinetic energy of the box, therefore doing no work on it :) mathematically it's correct, although it seems counterintuitive
@@annamauroam - lifting the mass upwards at the beginning means you have exerted a force AND work because the mass moved on the y axis initially and it's potential energy has increased "equal to the work you've done = mgh" - but when you move it horizontally "slowly" means that you didn't change it's velocity "didn't give it an acceleration", thus the kinetic energy didn't change and that indicates you didn't exert any work, as well as the potential energy remained constant! - if for example the box was fixed on a rail in such a way that only allows it to move horizontally and you pulled it with a rope with a 90 deg angle, the box will not move and your work is zero..
Mark, Board is internally lit with LEDs. This light is total internally reflected in the glass. Pens are fluorescent dry erase markers. Applying their ink to the glass frustrates the total internal reflection, making it bright and clearly visible. You can check us out here as well: www.learning.glass Cheers, Dr. A
Pls help me how I solve this word problem Q. If your mass is 40kg. Then your weight is roughly 400N. How much work do you have to do each time you go upstairs - a vertical height gain 2.5 m? Pls reply me with solution.
Work by Rihanna lol
That is great Professor!
Best physics lessons on youtube!
You're too kind. Thanks for the shout out.
Cheers,
Dr. A
GREAT PHYSICS LECTURES !!! :))
I never put together the kinematic equation to the kinetic energy equation in that way before. It was right in front of my eyes lol.
Seriously mind blown. LOL.
why o not you upload again.....you were really helping me in physic ,thank you for your efforts u are very welcome back here to teach us :)
actually if we move the mass perpendicular to the displacement vector the work equals to zero but you said in addition to this if we move the mass to the right so in this case the force vector is not just up component so there is an angle that is not equal to 90 degrees. Į couldnt understand this please if you explain i will be a very happy man.
He explained it towards the end, since he's moving the box slowly he's not changing the kinetic energy of the box, therefore doing no work on it :) mathematically it's correct, although it seems counterintuitive
@@annamauroam
- lifting the mass upwards at the beginning means you have exerted a force AND work because the mass moved on the y axis initially and it's potential energy has increased "equal to the work you've done = mgh"
- but when you move it horizontally "slowly" means that you didn't change it's velocity "didn't give it an acceleration", thus the kinetic energy didn't change and that indicates you didn't exert any work, as well as the potential energy remained constant!
- if for example the box was fixed on a rail in such a way that only allows it to move horizontally and you pulled it with a rope with a 90 deg angle, the box will not move and your work is zero..
How do you make the colors of the marker so bright on the board?
Mark,
Board is internally lit with LEDs. This light is total internally reflected in the glass. Pens are fluorescent dry erase markers. Applying their ink to the glass frustrates the total internal reflection, making it bright and clearly visible. You can check us out here as well: www.learning.glass
Cheers,
Dr. A
I realized that you were writing reversely.
OMG....Genius!
+Hunter
Hunter, thanks but unfortunately I'm no genius. Check it out here: ua-cam.com/video/CWHMtSNKxYA/v-deo.html
Cheers, Dr. A
It's mirrored
Pls help me how I solve this word problem
Q. If your mass is 40kg. Then your weight is roughly 400N. How much work do you have to do each time you go upstairs - a vertical height gain 2.5 m?
Pls reply me with solution.
Thank you so much professor Matt
محجوب ودقرشية,
You're very welcome. Glad you're enjoying the videos.
You might also like my new site: www.universityphysics.education
Cheers,
Dr. A
okay its been three years where is this guy now did he just vanish there are no new vids ?
I guess that's all he teaches about physics haha