# Tried Solving a Problem but Need Help?

• ChiralSuperfields
Oh true @PeroK! I forgot that the surface could be any shape! I was assuming that the surface was flat. That would be very hard to account for the shape of the surface doing it my way!! Thank you!f

#### ChiralSuperfields

Homework Statement
Relevant Equations

The solution is,
,
However is there a better way?

I tried using their suggestion of the definition of work and applying it in the x-direction.

But it does not seem to work.

Thanks for any help!

Last edited:
But is not dose seem to work.
Do you mean "But it does not seem to work."?

ChiralSuperfields
Do you mean "But it does not seem to work."?
Thanks for your reply @PeroK ! Yes, sorry that was what I meant - I have fixed it now.

Thanks for your reply @PeroK ! Yes, sorry that was what I meant - I have fixed it now.
What's the relevance of ##x## in this case? Did you understand the book solution?

ChiralSuperfields
What's the relevance of ##x## in this case? Did you understand the book solution?
Thanks for your reply @PeroK ! I thought maybe I could prove it in the x-direction first then extend it to more dimensions. But I guess I should probably use at least the cartesian coordinate system so do it in terms of the displacement vector ds like the solutions.

Thanks for your reply @PeroK ! I thought maybe I could prove it in the x-direction first then extend it to more dimensions. But I guess I should probably use at least the cartesian coordinate system so do it in terms of the displacement vector ds like the solutions.
What if the ##x## direction is normal to the surface?

ChiralSuperfields
What if the ##x## direction is normal to the surface?
Thanks for your reply @PeroK ! I guess that means that y-direction will be along the surface

Thanks for your reply @PeroK ! I guess that means that y-direction will be along the surface
The surface could be any shape and any orientation. Your attempted solution in general is doomed! Do you see that?

ChiralSuperfields
The surface could be any shape and any orientation. Your attempted solution in general is doomed! Do you see that?
Oh true @PeroK! I forgot that the surface could be any shape! I was assuming that the surface was flat. That would be very hard to account for the shape of the surface doing it my way!! Thank you!