{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture18_Pushkar_2011

# Lecture18_Pushkar_2011 - Midterm Exam 2 March 29 7:30-8:30...

This preview shows pages 1–9. Sign up to view the full content.

Lecture 18 Purdue University, Physics 220 1 Midterm Exam 2 March 29, 7:30-8:30 pm, STEW 183 will cover Chapters 6-10.

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

View Full Document
Lecture 18 Purdue University, Physics 220 2 Lecture 18 Elasticity and Oscillations PHYSICS 220
Lecture 4 Purdue University, Physics 220 3 Contact Force: Spring Force exerted by a spring is directly proportional to the amount by which it is stretched or compressed. F spring = - k x always trying to restore its original length

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

View Full Document
Lecture 18 Purdue University, Physics 220 4 Hooke’s Law Revisited Hooke’s Law F/A = Y * L/L 0 k = Y A/L 0 Y (Young’s Modules) independent of L or A Has the unit of (N/m 2 ) pressure (i.e., pascal) Inherent stiffness of a material For many materials, Y is the same for compression and tension, elastic constant Stress = Y*Strain Define Strain = L / L 0 Stress = F/A F = - k L; where k depends on size of the bar and material
Lecture 18 Purdue University, Physics 220 5 Beyond Hook’s Law Deformed beyond elastic limit material will no longer return to its original length even when F is completely removed.

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

View Full Document
Lecture 18 Purdue University, Physics 220 6 Simple Harmonic Oscillation The force exerted by a spring is proportional to the distance the spring is stretched or compressed from its relaxed position. F X = -k x x is the displacement from the relaxed position and k is the constant of proportionality.
Lecture 18 Purdue University, Physics 220 7 Potential Energy in Spring Force of spring is conservative F = -k x PE = -W W = -½ k x 2 PE= ½ k x 2 Work done only depends on initial and final position Force x work

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

View Full Document
Lecture 18 Purdue University, Physics 220 8 Energy Conservation A mass is attached to a spring and set to motion. The maximum displacement is
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