PHYS 2101 Lecture : Lecture10
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Wednesday feb. 8, 2012: si sessions: (i emailed this info to you ) Of ce hours: wednesday and thursday from 3:00-4:00 in allen 039. Hw4 is due monday at 11:59pm: exam 2 : feb 28@ 6pm in lockett 16 (our section) Exam 2 covers chapters 7-9: exam 1 scores on moodle, out of 50 points average for our section 35. 71 = 71% Hint: force steepness of hill: we know how to get potential energy from force Say a force is applied from position x1 to x: But this is minus the change in pe! = "(u(x) "u(x1)) how to get a formula for force? x x1: differentiate both sides . Fgrav (y) = ! dugrav (y) dy d mgy dy. Fspring (x) = ! duspring (x) dx d 1. Plot of u(x), the potential energy as a function of position for a particle moving in 1-d (think of a particle on a hill)
