PHYS 2101 Lecture : Lecture 10
Document Summary
Announcements feb. 8, 2012 wednesday (10th: hw #4 is already posted longer . ~27% got f"s (you need to ask your- self or me how you can do better . ) This was worth only 7. 7% of nal grade !e mech = 0 " !ke = #!u isolated system. Separate your system from its environment : earth, spring, block . Potential energy curve & external work (emech versus etot) No friction, drag, external forces (only conservative forces) E mech = 0 ke = u. A block of mass m is dropped from height h onto a spring of spring constant k. find the maximum distance d the spring is compressed. isolated system. U grav = mgy & u spring = 1. In 1-d: u (x) = w cons. U ( x) where f is a slowly varying, internal force acting on a particle in system then.
