quick question as well, I thought the normal force should not really equal the weight because there need to be a centripetal acceleration to keep us rotating with the Earth. I learnt that in my physics class. And I have another question about the rotational of the earth. Is the earth doing work on us to keep us moving with the earth? Where do we get that rotational energy from?
@804YankeeFan Yes, you are correct. The difference is small, though, and is typically ignored for basic problems like the one in this example.
The earth is not doing work on us to keep us rotating. The earth continues to rotate (and we along with it) as long as there is no friction to stop it, and there basically is none. Think of it as rotational inertia. The rotational energy of the earth was there when the earth was formed, and it is still there.
@nabeel223903 Good question. And there is a very good answer: If the forces are balanced, that means that there is no acceleration. So the velocity will not change. If it is already moving, the fact that the forces are balanced means it will keep moving at a constant speed. There was, presumably, some larger force that got it moving from rest, but once it's moving, the total net force to keep it moving at a constant velocity will be zero.
ur articulation is perfect
TheSergiomadrid10 1 month ago
quick question as well, I thought the normal force should not really equal the weight because there need to be a centripetal acceleration to keep us rotating with the Earth. I learnt that in my physics class. And I have another question about the rotational of the earth. Is the earth doing work on us to keep us moving with the earth? Where do we get that rotational energy from?
804YankeeFan 2 months ago in playlist Physics - Friction Example Problems
@804YankeeFan Yes, you are correct. The difference is small, though, and is typically ignored for basic problems like the one in this example.
The earth is not doing work on us to keep us rotating. The earth continues to rotate (and we along with it) as long as there is no friction to stop it, and there basically is none. Think of it as rotational inertia. The rotational energy of the earth was there when the earth was formed, and it is still there.
derekowens 1 month ago
quick question, if the fnet is 0, then how is the object moving at a velocity? if all forces are balanced, wont the object not move?
nabeel223903 1 year ago
@nabeel223903 Good question. And there is a very good answer: If the forces are balanced, that means that there is no acceleration. So the velocity will not change. If it is already moving, the fact that the forces are balanced means it will keep moving at a constant speed. There was, presumably, some larger force that got it moving from rest, but once it's moving, the total net force to keep it moving at a constant velocity will be zero.
derekowens 1 year ago
Thank-you got this question in less than a minute :)
Itswalrus 1 year ago
yaaaaaaaa truly
shadstheking 1 year ago
Your videos deserve many more views than they have right now. Good job!
Monsterenergy791 1 year ago
you are a legend
2much2teach 2 years ago 9