TBR Limiting Cases

[Synapsis]

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I'm at the end of TBR Physics I, and I've avoided using this technique because it doesn't make sense to me. I'd like to start using it so I can move more quickly, but I don't quite understand it.

I understand what we're doing, but when can we use this technique? Why can we use it? What the heck is going on?

 

[Patassa]

I'm at the end of TBR Physics I, and I've avoided using this technique because it doesn't make sense to me. I'd like to start using it so I can move more quickly, but I don't quite understand it.

I understand what we're doing, but when can we use this technique? Why can we use it? What the heck is going on?

It's really just a tool to apply intuition by mentally manipulating variable to predict outcomes on the system. If it doesn't make sense to you you're not missing much by not doing it.

It's great for vectors because you can say, ok what if my angle was 0 and I had no y component, what would that do to my force/friction/acceleration/etc or what if the angle was 90 and I had no x component, what would that graph look like.

Or in a circuit where you could say, ok what if my resistance was almost 0 what would that do to the amperage or what if my current was almost infinity or almost 0 what does that do to my charging time on the capacitor.

It's basically just manipulating the variables in your head to extreme cases to show you have the system would be affected, it helps rule out incorrect answers more so than give you the correct answer, in my opinion.

 

[Jepstein30]

I'm at the end of TBR Physics I, and I've avoided using this technique because it doesn't make sense to me. I'd like to start using it so I can move more quickly, but I don't quite understand it.

I understand what we're doing, but when can we use this technique? Why can we use it? What the heck is going on?

Best to use this technique when you are given an unfamiliar equation that has a decent amount of calculations involved. You'll see some examples doing various passages.

Let's you avoid the calculations which take up time and mistake-inducing.

All you're doing is manipulating the variables in the equation by plugging in infinity (really, a very high number) or zero (really, a very low number).