1. Physics 218: Mechanics Instructor: Dr. Tatiana Erukhimova Lecture 40

2. Ch. 17 Statics

3. There is a ladder against a wall. There is no friction at the wall and the coefficient of friction at the floor is . At what angle can the ladder be placed so that it would slip if the angle were decreased infinitesimally?

4. The advantage of a lever GIVE ME A PLACE TO STAND AND I WILL MOVE THE EARTH

7. The advantage of a pulley What minimum force F is needed to lift the piano of mass M?

8. Simple harmonic oscillator

9. The forces No force Force in –x direction Force in +x direction

10. More Detail Time

11. Some Terms Amplitude: Max distance Period: Time it takes to get back to here

12. A block with mass m is attached to the end of a spring, with spring constant k. The spring is stretched a distance L and let go at t=0 Find the position of the mass at all times Where does the maximum speed occur? What is the maximum speed?