PSC 1121 Lecture 17: 11:01:16 Lecture
Document Summary
Oscillating systems (cid:1831)= (cid:883)(cid:884)(cid:2870) (cid:1831)= (cid:883)(cid:884)(cid:2870)+(cid:883)(cid:884)(cid:883)(cid:1868)^(cid:884) i. e. , the square the coordinate: potential energy is always (cid:862)(cid:395)uad(cid:396)atic(cid:863) of a coo(cid:396)di(cid:374)ate. E. g. , (cid:2870) for travel on the x-axis: kinetic energy is also quadratic in , the time rate of change of the coordinate. Kinetic energy and potential energy change, but always add up to e. Perpindcular sides change but always frame the same hypotenuse. Angular momentum (cid:2870)/(cid:1871) or, in this context, action. Coulomb the scientist: a military engineer, to start. Down in martinique: in 1776 moved to paris and became an academic scientist, developed a balance for measuring very small forces. Twist angle correlated to force: used his torsion balance to figure out static electric charges and the force between them, the coulomb interaction. The coulomb interaction: similar to universal gravitation. Distance apart weaker with distance: unlike gravitation. Ca(cid:374) (cid:396)epel, if two cha(cid:396)ges a(cid:396)e (cid:862)like(cid:863)
