Deriving the Binding Energy of a Planet

[@Akash-ib7vv]

finished physics in school a while ago, just love coming back to these kinds of videos!!

[@FlippingPhysics]

That is awesome. It never really occurred to me when I started making these videos that anyone other than current physics students would learn from them. I was wrong.

[@nicholasorton17]

Love these video. So much work goes into them and it shows. Thank you

[@FlippingPhysics]

You are welcome!

[@kaushalyaagarwal4320]

I liked the video very much. It is really a very good explaination and cleared all my concept. By the way I am from India 🇳🇪🇳🇪

[@flanker1497]

why the heck you have to mention that all the time, and also it is IN not NE

[@PoojaGupta-ys4ge]

Your video is truly undrstandable in easy way.Try to upload more videos in a week

[@FlippingPhysics]

I wish I could, however, I have to maintain a "real" job as well.

[@PoojaGupta-ys4ge]

Whats real job means,Dear teacher?

[@FlippingPhysics]

I have a real job as a part-time high school physics teacher. Flipping Physics does not pay the bills ... yet.

[@tomantony6495]

I have trouble in remembering physics derivation I mug up everything even I hard to try to cement on my mind write rewrite the steps and finally at certain point my brain become freeze in exam hall I absent minded to figure what is the next step how to reach final answer what qualities applied

[@The_Green_Man_OAP]

0:50 He sort of sneaks up on you there... What happens if he just freezes and holds the book? He is still doing work, right? It isn't useful though... 📖 💪🏋️ Try to hold a book like that out at arms length.. I predict that your arm length will increase! Tension beyond equilibrium means work is done (like with springs).

[@BrianEllis-w9j]

You're probably confusing effort with work. Work is defined as the transfer of energy into or out of a system, and calculated as a product of a force applied through a displacement. You're applying a force to the book if you hold it still, but you are NOT moving it through a displacement. You're not making the book get faster, and you're not increasing the PEg of the Earth-book system, so you are NOT doing any work on the Earth-book system.

[@uah9031]

This topic isn't mentioned explicitly in the AP Physics 1 course outline. Can we leave it out or should we do it?

[@FlippingPhysics]

Escape velocity is not mentioned _explicitly_ in the AP Physics 1 course outline either. There are all sorts of topics which are direct outcomes of the topics in the AP Physics 1 course outline which you should be familiar with. Binding energy is one of them.

[@uah9031]

Okay. Thanks

[@carultch]

I thought this might be a Calculus problem where you derive layer-by-layer the binding energy of each spherical shell of Earth's mass, and integrate the answer to find the total self-binding energy of the planet.

[@FlippingPhysics]

Ah, interesting perspective. Clearly not what I was going for here...

[@ptyptypty3]

so, if I'm down in a WELL that's 10 meters deep.. and I consider the top of the well to have a PE of ZERO... then if I jump really hard and establish an Initial KE = |PE|.. then I can escape the WELL and be free?... so PE at the bottom of the well would equal, let's say.. -10 J.. so I have to jump hard enough with a Velocity Vi to have (1/2) m(Vi)^2 = 10 j in order to get out? Oh I see, KE + PE = 0 .... I get it !!! coolio..

[@carultch]

Yes, this is correct. Assuming your mass is 102 grams. For a human body, -10 kJ is a more realistic number for your potential energy at the bottom of a 10 meter deep well. Jumping out of a 10 meter well is extremely unrealistic for the capacity of a person on this planet.

[@evanofford3813]

We all have Bo in our class

[@FlippingPhysics]

Agreed.