Exam2 Review - 1Phys1110 Exam 2 Review:Everything from Exam I!- algebra, trigonometry, unit conversions, - 1D Motion: xvtD=D, vatD=D, graphs, slopesconstant acceleration formulas: ov v a t= +, etc- Vectors! vector addition, vector components2D Motion:-1 2va , v v vtD= +D =Drrr r r - Projectile Motiontreat x- and y-motions independentlyax = 0 - vx = constantay = – g - vy = voy – g t , etc- Circular Motion with constant speed v, 2va ar= �rneta and Frr are toward the center (centripetal)- Newton's Lawsnet 1 2 3 iiF F F F .. F= + + + =�r r r r rNI: netF 0 v constant= � =rrNII: netF m a=rrNIII: AB BAF F=-r rNew material since Exam I1/14/2019 - University of Colorado at Boulderyvoxvx-vyax = 0ay = –ga AFABBFBArvvaaExam2 Review - 2Force and motion problems with one or more bodies:1) Draw Free-body diagram 2) Choose Coordinate system3) x x y yF m a , F m a= =� �1/14/2019 - University of Colorado at BoulderExam2 Review - 3Friction f- sliding friction: f = -K N- static friction: 0 < f < fmax = -S NWork and Energy-work done by force F: = �DvvFW F r, work can be (+), (-), or zero-Hooke's Law: Fspring = - k x (k = spring constant)-work-energy principle: netW KE=D-Definition of PE associated with conservative force F: D = -F FPE W-PEgrav = m g h PEelastic = (1/2) k x2-If no sliding friction, so no thermal energy generated : Emech = KE + PE = constant-If sliding friction, KE + PE + Ethermal = constant-Power WPtD=DGravityNewton's Universal Law of gravity:1 22m mF Gr=Acceleration due to gravitynet2 2F m aG M m G Mm g gr r== � =r = distance to center of planetOrbits, Kepler's laws= = -gravGMmPE U(r)r Know how to use conservation of energy to derive escape speed.1/14/2019 - University of Colorado at Boulderrm1m2FFdistance measured from centersRmass Mmass m, in free-fallPlanetrExam2 Review - 4To prepare for Exam 2:- Review Concept Tests, CAPA problems, Tutorial HW. (Read question and try to remember reasoning that gets to the answer)- When reviewing CAPA problems, know how to derive algebraic formula for answer.- Prepare your formula sheet.- Take the practice exam.- It is no good to memorize answers. You have to understand and remember how you construct the answers.1/14/2019 - University of Colorado at
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