Lecture+24

Lecture+24 - 440:221 Intro to Engineering Mechanics:...

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440:221 Intro to Engineering Mechanics: Statics Course Instructor: Alberto Cuitino Course TAs: Pam Carabetta and Jingru Zhang Lecture 24 Fall 2009 1 Based on Textbook Material: Engineering Mechanics Statics, 12 th Edition, R.C. Hibbeler, Pearson 2010.
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440:221 Lectures riction (dry) Friction (dry) School of Engineering, Fall 2009 2
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440:221 Lectures ears Gears School of Engineering, Fall 2009 3 http://mems.sandia.gov/gallery/images/
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440:221 Lectures ears Gears School of Engineering, Fall 2009 4 http://mems.sandia.gov/gallery/images/
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440:221 Lectures ears and ??? Gears and ??? School of Engineering, Fall 2009 5 http://mems.sandia.gov/gallery/images/
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440:221 Lectures ears and a spider mite Gears and a spider mite School of Engineering, Fall 2009 6 http://mems.sandia.gov/gallery/images/
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440:221 Lectures pider mites Spider mites bout /100 to 3/100 ch ng about 2/100 to 3/100 inch long School of Engineering, Fall 2009 7 http://tfpg.cas.psu.edu/images/TwospottedSpiderMite.gif&imgrefurl
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440:221 Lectures pider mites and leaf and a thumb Spider mites and leaf and a thumb … School of Engineering, Fall 2009 8 http://www.ctahr.hawaii.edu/nelsons/Misc
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440:221 Lectures opics to be covered Topics to be covered • What is dry friction? • What is the mechanisms of dry friction? • What is s and k ? • What is the physical meaning of impending motion? School of Engineering, Fall 2009 9
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440:221 Lectures eading quiz A friction force always acts to the contact surface Reading quiz 1. A friction force always acts _____ to the contact surface. A) Normal B) At 45 ° ) Parallel ) At the angle of static friction C) Parallel D) At the angle of static friction C) 2. If a block is stationary, then the friction force acting on it is ________ . A)  s N B) = s N C)  s N D) = k N A) School of Engineering, Fall 2009
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440:221 Lectures pplication In esigning brake Application designing a brake system for a bicycle, car, or any other vehicle, it is important to understand the frictional forces involved. For an applied force on the brake pads, how can e determine the we determine the magnitude and direction of the resulting friction rce? School of Engineering, Fall 2009 force?
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440:221 Lectures pplications The rope is used to tow e refrigerator Applications the refrigerator. In order to move the frigerator is it best to refrigerator, is it best to pull up as shown, pull horizontally, or pull downwards on the rope? What physical factors p affect the answer to this question?
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This note was uploaded on 09/12/2011 for the course ENG 221 taught by Professor P.sannuti during the Fall '09 term at Rutgers.

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Lecture+24 - 440:221 Intro to Engineering Mechanics:...

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