Lecture 11

Lecture 11 - 1 Physics 231 General University Physics...

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Unformatted text preview: 1 Physics 231 General University Physics Spring 2007 Lecture 11 Today Â¡ Friction Â¡ Application of Newtonâ€™s Laws with Friction Friction Â¡ Demo: Slide object along table Â¢ Direction of acceleration Â¢ Direction of net force Â¡ Demo: Rob hands together Â¢ Direction of forces Â¡ Demo: Drag block across table with spring meter Â¢ Kinetic friction Forces of Friction Â¡ When an object is in motion on a surface or through a viscous medium, there will be a resistance to the motion Â¡ This is due to the interactions between the object and its environment Â¡ This resistance is called the force of friction Kinetic Friction Â¡ Demo: Drag block across table with spring meter Â¡ Empirically (approximate and not fundamental) Â¢ f K (nearly) independent of velocity, surface area of contact Â¢ Proportional to normal force Â¢ Coefficient of kinetic friction | | | | K K f n Î¼ = G G Static Friction Â¡ Demo: Pull block with spring meter so it does not move Â¢ Free body diagram Â¢ Acceleration is zero Â¢ Object remains at rest if...
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This note was uploaded on 11/16/2010 for the course PHY 231 taught by Professor Ellis during the Spring '08 term at Kentucky.

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Lecture 11 - 1 Physics 231 General University Physics...

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