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Unformatted text preview: 1 Physics 1D03 - Lecture 8 Newtons Laws (III) Newtons 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, 33, 45, 65 Physics 1D03 - Lecture 8 Each block weighs 100 N, and the coefficient of static friction between each pair of surfaces is 0.50. What minimum force F P is needed to pull the lower block out? 100 N 100 N Quiz a) 50 N b) 100 N c) 150 N F P 2 Physics 1D03 - Lecture 8 Equilibrium A special case : (object doesnt move, or moves at constant velocity) Newtons second law gives This is equivalent to three independent component equations: , etc. We can solve for 3 unknowns (or 2, in 2-D problems) = a r = = a m F r r The vector sum of forces acting on a body in equilibrium is zero = x F Physics 1D03 - Lecture 8 Example A block is in equilibrium on a frictionless ramp. What is the tension in the rope?...
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