Exam2 Review - 1 3/7/2011 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 New material since Exam I 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 3/7/2011 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 Know how to use conservation of energy to derive escape speed. r m1 m2 F F distance measured from centers R mass M mass m, in free-fall Planet rExam2 Review - 3 3/7/2011 University of Colorado at Boulder To 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
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