PHY 121 Study Guide - Midterm Guide: Fax, Gravitational Energy, Momentum
Document Summary
Ph(cid:455)si(cid:272)al s(cid:455)ste(cid:373) so fa(cid:396) (cid:396)e(cid:373)o(cid:448)ed f(cid:396)o(cid:373) othe(cid:396) s(cid:455)ste(cid:373)s that it does(cid:374)"t i(cid:374)te(cid:396)a(cid:272)ti(cid:448)e w/them. Total linear moment of the system remains constant. Add them as vector, so they should be equal f = i. Not: p = pa+pb pa, pb as total momentum. Ex: 2 objects collide on a frictionless surface. One of the objects is at rest before the collision. One of the o(cid:271)je(cid:272)t"s is at (cid:396)est. Neither of the objects are at rest. Which 2 particles come close to each other and interact by means of forces. If external forces are ignored, the total linear momentum is conserved. Elastic collisions: total ke of the system is conserved. K(cid:2869)(cid:2916)+k(cid:2870)(cid:2916)=(cid:882) both of the those need to be k(cid:2869)(cid:2916)=(cid:882),k(cid:2870)(cid:2916)=(cid:882) k(cid:2916)=(cid:882) P (cid:2869)= p (cid:2870) opposite and going towards each other. 1d example (cid:4672). (cid:887) kg (cid:883)(cid:2923)(cid:2929)(cid:4673)+(cid:4672). (cid:885) kg (cid:885)(cid:2923)(cid:2929)(cid:4673)=(cid:4666). (cid:887) kg(cid:4667)v(cid:2885)(cid:2916)(cid:2934)+(cid:4672). (cid:885) kg (cid:884)(cid:2923)(cid:2929)(cid:4673) V(cid:2885)(cid:2916)(cid:2934)= (cid:884)(cid:2923)(cid:2929) the sign of the final result will tell you the direction.
