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 ¡ Friction ¡ Application of Newton’s Laws with Friction Friction ¡ Demo: Slide object along table ¢ Direction of acceleration ¢ Direction of net force ¡ Demo: Rob hands together ¢ Direction of forces ¡ Demo: Drag block across table with spring meter ¢ Kinetic friction Forces of Friction ¡ When an object is in motion on a surface or through a viscous medium, there will be a resistance to the motion ¡ This is due to the interactions between the object and its environment ¡ This resistance is called the force of friction Kinetic Friction ¡ Demo: Drag block across table with spring meter ¡ Empirically (approximate and not fundamental) ¢ f K (nearly) independent of velocity, surface area of contact ¢ Proportional to normal force ¢ Coefficient of kinetic friction | | | | K K f n μ = G G Static Friction ¡ Demo: Pull block with spring meter so it does not move ¢ Free body diagram ¢ Acceleration is zero ¢ 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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