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me Date co F f NCEPTUAL hySIC PRACTICE PAGE ghapter 7 Energy ”@" PE= 15000 J onservation of Ene 5 c rgy KE= 0 1. Fill the blanks for the six systems. =30k, U= 60k U =90 kmf, KE=10%3 KE=U'027 ke.d (o J - ¢ - PE=112507 SR RN WakoW - keni1seg, KE= 7500 PE= 37507 KE=[[2507 @

" CONCEPTUAL F hys’cm Chapter 7 Energy Energy and Momentum : 4 A compact car and a full-size sedan are itntirtjiallsye(a;ta ;ez; 2n t;i:eoralzor:tjlé }??nra:sg ;gtt:; ‘zgr:gae o w o i implici assume that the ' E:::gl cclgt;s'::r:lsflcr; Egglg;ew:pplied to each car and th:yfac(-;:z':(::jrz;et ha;::gtsst ::[f,:r]cilia:cgg car . icti h the far i uddeny e friction). When they reac (remclg?a?j"e“:::r:figgt: [?1;; salil t)hrough the air and crash to the ground below. (The cars . oo iment! wrecks to begin with, and this is a scientiic experiment!) R e e e D LAt RISE ) Ut pogd ot Tl S TR ______f¢/‘\\ 1. Which car has the greater acceleration? (Think @ = Fim.) Ry 1 )s A Tht Comfack A~ \ V N\ 2. Which car spends more time along the surface of the o ( \ Q (The faster or slower one?) The Sedel) LS ; " 7 3. Which car has the larger impulse imparted to it by the applied force? (Think Impulse = Ft.) Defend your answer. ny toml RS se h@r.:?/' S_uy")lt ‘r’oY’aE ot ovel o (ory MR L Gl 4. Which car has the greater momentum at the edge of the cliff? Impulse = A (Think Ft = Amv.) Defend your answer. S 1 Proamg f) S€oul e (oo dne (mRUINC The (fyef Twas. PTTR 5. Which car has the greater work done on it by the appl?ed force? @ (Think W = Fd.) Defend your answer in terms of the distance tra\{elefi- s Some WollC “pecyLST fale eMy distn™® )5 T 5 6. Which car has the greater kinetic energy at the edge of the cliff? (Think W= AKE.) Does your answer follow from your explanation of Question 57 Does it contradict your answer to Question 3? Why or why not? ICF T cone, Graetel monent(ih of- N5 TUt o greettl mets Making the distinction between momentum and kinetic energy is high-level physics, T Whj‘ch car spends more time in the air, from the edge of the cliff onto the ground below? Kot+n wrt the cutn€ AP 8. Which car lands farther horizontally from the edge of the cliff onto the ground below? CotmPucy Challenge: Suppose the slower car crashes a horizontal distance of 10 m from the ledge. Then at what horizontal distance does the faster car hit? T he Lo el i ( = Fi 68 ot [n +o Sru els bl [kl L) ! {5 S 3 K = ':,\t ) ] 40 é