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12 Pages

### Lecture09

Course: PHYS 218, Fall 2009
School: Texas A&M
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Word Count: 512

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218 Physics Lecture 9 Dr. David Toback Physics 218, Lecture IX 1 Overview Todays lecture is about problem solving for Chapters 4 &amp; 5 Learn how to use everything weve learned so far to solve problems with: Rope Friction Friction and Uniform Circular Motion Physics 218, Lecture IX 2 Physics 218, Lecture IX 3 Rope Problems A PHYS218 rope is a perfect rope. It is massless and it doesnt stretch. This...

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218 Physics Lecture 9 Dr. David Toback Physics 218, Lecture IX 1 Overview Todays lecture is about problem solving for Chapters 4 & 5 Learn how to use everything weve learned so far to solve problems with: Rope Friction Friction and Uniform Circular Motion Physics 218, Lecture IX 2 Physics 218, Lecture IX 3 Rope Problems A PHYS218 rope is a perfect rope. It is massless and it doesnt stretch. This means: The acceleration of any part of a rope is the same as any other part The magnitude of the acceleration of the two things it attaches are equal The tension (Force) exerted by each end is the same Physics 218, Lecture IX 4 Two Boxes and a Pulley You hold two boxes, m1 and Ignore the mass of the pulley m2, connected by a rope and rope and any friction running over a pulley at associated with the pulley rest. The coefficient of kinetic friction between the table and box I is . You then let go and the mass m2 is so large that the system accelerates Q: What is the magnitude of the acceleration of the system? Physics 218, Lecture IX 5 Banking Angle You are a driver on the NASCAR circuit. Your car has m and is traveling with a speed V around a curve with Radius R What angle, , should the road be banked so that no friction is required? Physics 218, Lecture IX 6 Skiing You are the ski designer for the Olympic ski team. Your best skier has mass m. She plans to go down a mountain of angle and needs an acceleration a in order to the win race What coefficient of friction, , do her skis need to have? 7 Physics 218, Lecture IX Skidding on a Curve A car of mass m rounds a curve on a flat road of radius R at a speed V. What coefficient of friction is required so there is no skidding? Kinetic or static friction? Physics 218, Lecture IX 8 2 boxes connected with a string Two boxes with masses m1 and m2 are placed on a frictionless horizontal surface and pulled with a Force FP. Assume the string between doesnt stretch and is massless. a)What is the acceleration of the boxes? b)What is the tension of the strings between the boxes? M2 M1 Physics 218, Lecture IX 9 An Incline, a Pulley and two Boxes In the diagram given, m1 and m2 remain at rest and the angle is known. The coefficient of m2 static friction is and m1 is known. What is the mass m2? Ignore the mass of the pulley and cord ...

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