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# 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, 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

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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) 0 = a r 0 = = a m F r r The vector sum of forces acting on a body in equilibrium is zero 0 = x F Physics 1D03 - Lecture 8 Example A block is in equilibrium on a frictionless ramp. What is the tension in the rope? m φ
3 Physics 1D03 - Lecture 8 Quiz The same block is in equilibrium on the same frictionless ramp, but the rope is horizontal . The

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

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