{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Phys Test2 Review

# Phys Test2 Review - Physics 2305 rev 2 s08 1 Ch 7 Potential...

This preview shows pages 1–3. Sign up to view the full content.

Physics 2305, rev 2, s08 1 Ch. 7 Potential Energy and Energy Conservation Gravitational Potential Energy U ( y ) = mgy Elastic potential energy U ( x ) = 1 2 kx 2 or, more generally, U ( x ) = 1 2 k ( x x 0 ) 2 . ¥ Forces that have potential energy are called conservative . For motion under conservative force: W = U 1 U 2 = K 2 K 1 K 2 + U 2 = K 1 + U 1 i..e, the total energy E = K + U = 1 2 mv 2 + mgy is constant (conserved) during motion; changes from one motion to another Relation between potential energy and force in one dimension F = dU dx , U ( x ) = Z F ( x ) dx Force from potential energy in three dimensions: F x = U x , F y = U y , F z = U z When both conservative and nonconservative forces are present then W noncons = E 2 E 1 where E includes only energy of conservative forces. ¥ Energy diagrams

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Physics 2305, rev 2, s08 2 At equilibrium points F = dU/dx = 0 . If d 2 U/dx 2 > 0 the equilibrium is stable; if d 2 U/dx 2 < 0 the equilibrium is unstable.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern