Recent content by John Mohr

@TSny @kuruman This is crazy to realize for me. I've been teaching it this way for years and many other teachers I know teach it this way too. This video segment is a prime example. It's amazing how these things make their way into our misunderstandings. Thanks again. John

Thank you so much for your help!

Very good! For some reason, I've used 1/2m(deltav)^2 in the past. This is my mistake. Is there any use for this expression or is this completely wrong and never used?

Hello, For some reason I'm not seeing something in working out a question two ways. The question I'm working through reads: "A 2500 kg car changes from a velocity of 15 m/s to 25 m/s over a distance of 450 m. What is the work done on the car by the engine?" I've attached my quandry. I've...

Yes, sorry @davenn - I certainly appreciate the answer posts (and the jovial banter too). Thanks for sharing your thoughts. Although the video seemed good in some ways, it seemed a little misleading at the point where it talked about electrons not being emitted from the negative terminal at...

Yes, this is what I have thought as well, but the video clip seems to say something different.

Mmm... I must not be understanding something here quite right. When you say 'new' in the first question above, I would have assumed yes because in order for there to be a current, there has to be some input for that current. This current then ends up at the positive terminal where the electrons...

I guess to add a Shakespearian flare, "...to supply or not supply, that is the question". In other words, is there a source of charged particles coming from the battery or not? This video seems to suggest that there are no electrons coming out of the battery.

I have held the assumption that batteries supply electrons at the negative terminal and absorb electrons at the positive end for many years. However, after watching this video at about 3:30, it is said that batteries do not actually supply charged particles but that the battery only creates an...

Sorry Chestermiller, I didn't mean to stop our conversation prematurely. Please, yes, I would be interested in the solution you have proposed.

Yes, I think I see it. Thank you Chestermiller, this has certainly helped me see the vertical case of circular motion with better clarity. It's been 25 years since I've done any calculus so I had to watch a video relating to the proof, but I think I got it. Thanks again for getting me to think...

Hello Chestermiller, I've given the problem some thought and here's what I've come up with. How does this seem to you?

Hey that's right A.T., your right! I didn't see that before. Very cool - so it does say something about this. And from my own reference too.

Ok, so I will do my best to address each person's comment the best I can. But, perhaps to start, I thought a visual example might be helpful to explain what I've seen before. I know there is a whole lot more going on with the physics on this example but I'm hoping the general idea will be...

Thank you to everyone for your comments. I’m sorry I didn’t include a diagram earlier. I got home and finally had a chance to draw a diagram of what I mean.