Presentation on theme: "Oscillations, continued Lecture 31 Wednesday, November 19."— Presentation transcript:
Oscillations, continued Lecture 31 Wednesday, November 19
Workbook problems due Today WB 10.5, problems 14-25
Workbook Problems due Friday Problems 14-1 through 8, pages 14-1 -- 5
Quiz A student places her 500g physics textbook on a frictionless table. She pushes the book against a spring 4.00cm and then releases the book. What is the book’s speed as it slides away? The spring constant is k = 1250 N/m.
Equilibrium and Oscillation Frequency and Period
Simple Harmonic Motion Linear restoring force— – Example, mass on a spring – Set y=0 at equilibrium point: –
Problem 14.15 A) When the displacement of a mass on a spring is ½A, what fraction of the mechanical energy is kinetic energy and what fraction is potential?
B) At what displacement as a fraction of A, is the energy half kinetic and half potential?
Problem 14.30 The center of gravity of a lower leg of a cadaver which had a mass of 5kg was located 18cm from the knee. When pivoted at the knee, the oscillation frequency was 1.6Hz. What is the moment of inertia of the lower leg?