# lecture8 - Newtons Laws(III More Friction Blocks on ramps...

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1 Physics 1D03 - Lecture 8 Newton’s Laws (III) More Friction Blocks on ramps, and other 2-D problems Serway and Jewett 5.7, 5.8 Practice Problems : Chapter 5, problems 21, 35, 43, 47, 48, 63 Physics 1D03 - Lecture 7 Friction μ s (“coefficient of static friction”) μ k (“coefficient of kinetic friction”) (“ μ ” is a Greek letter, pronounced “mu” ) Coulomb’s rules are: Static friction: Kinetic friction: n f n f k k s s μ μ = Physics 1D03 - Lecture 8 A 4-kg physics textbook and a 2-kg physics textbook are both thrown at the same initial speed v 0 and slide across the floor. Which book slides farthest before stopping? Quiz a) The heavy book slides about twice as far. b) The lighter book slides about twice as far. c) Both books slide about the same distance. Physics 1D03 - Lecture 8 Equilibrium A special case : (object doesn’t move, or moves at constant velocity) Newton’s second law gives This is equivalent to three independent component equations: , etc.

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