lecture8 - 1 Physics 1D03 Lecture 8 Newton’s Laws(III...

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Unformatted text preview: 1 Physics 1D03 - Lecture 8 Newton’s Laws (III) 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, 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 doesn’t move, or moves at constant velocity) • Newton’s 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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lecture8 - 1 Physics 1D03 Lecture 8 Newton’s Laws(III...

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