1. Physics 218: Mechanics Instructor: Dr. Tatiana Erukhimova Lecture 28

2. Please return you optional homework

3. Exercise 4 k1k1 k2k2 m x=0

4. Resonance amplitude

5. Frames of reference

6. This means that in the freely-falling elevator cabin you don’t feel any effects of gravity! You and all objects around you experience the same acceleration. In outer space you can imitate the effect of gravity by acceleration.

7. Newton’s First Law Second Law Third Law

8. Kinematics is given, you can find If and

9. Work Energy Theorem

10. does NOT depend on path!

11. Mechanical energy is conserved!

12. Conservation of Momentum If the collision is perfectly elastic, the kinetic energy is conserved!

13. Circular Motion y x

14. Conservation of Angular Momentum For symmetrical objects rotating about their axis of symmetry: Second Law: m1 m2 R

15. Harmonic Motion Resonance:

16. Final exam: room 204 MPHY, 1- 3pm, Wednesday, December 15. Help Sessions: By appointment Thursday, December 9th, 1pm 204 MPHY Monday?