PHYS 2101 Lecture : Lecture9
Document Summary
Monday feb. 6, 2012: si sessions: (i emailed this info to you ) Of ce hours: wednesday and thursday from 3:00-4:00 in allen 039. Today : chapter 8 potential energy & conservation of energy. You are moving out of town and need to load a heavy box of mass m into the back of the moving truck. You can either pick the box straight up and set it in the truck (a height h above the ground) or slide the box a distance l up a ramp into the back of the truck. Assume the ramp has good rollers on it, so that it is frictionless. Potential energy: potential energy: energy stored in the con guration of a system. If we lift a ball high in the air, its potential energy is increased. Energy is stored in the fact that the ball is up high. Similar idea: drive a car up to the top of a steep hill.
