Exam2 Review - 1 3/8/2009 University of Colorado at Boulder Phys1110 Exam 2 Review: Everything from Exam I! algebra, trigonometry, unit conversions, 1D Motion: xvt, vat, graphs, slopes constant acceleration formulas: ov v a t, etc Vectors! vector addition, vector components 2D Motion: 12va , v v vt Projectile Motion treat x- and y-motions independently ax = 0 vx = constant ay = – g vy = voy – g t , etc Circular Motion with constant speed v, 2vaar neta and F are toward the center (centripetal) Newton's Laws net 1 2 3 iiF F F F .. F NI: netF 0 v constant NII: netF m a NIII: AB BAFF Material Since Exam 2 Force and motion problems with one or more bodies: 1) Draw Free-body diagram 2) Choose Coordinate system 3) x x y yF m a , F m a y vo x vx vy ax = 0 ay = –g a A FAB B FBA r v v a aExam2 Review - 2 3/8/2009 University of Colorado at Boulder Friction f sliding friction: f = K N static friction: 0 < f < fmax = S N Work and Energy work done by force F: FW F r, work can be (+), ( ), or zero Hooke's Law: Fspring = k x (k = spring constant) work-energy principle: netW KE Definition of PE associated with conservative force F: FFPE 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 WPt Gravity Newton's Universal Law of gravity: 122mmFGr Acceleration due to gravity net22F maG M m G Mmg grr r = distance to center of planet Orbits, Kepler's laws gravGMmPE U(r)r r m1 m2 F F distance measured from centers R mass M mass m, in free-fall Planet rExam2 Review - 3 3/8/2009 University of Colorado at Boulder To prepare for an Exam: Review Concept Tests and CAPA problems. (Read question and try to remember reasoning that gets to the answer) Prepare your formula sheet (1 sheet only) Take the practice exam. It is no good to memorize answers. You have to understand and remember how you construct the
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