9lecture2a08

9lecture2a08 - Physics 2A Lecture 9: Jan 28 Vivek Sharma...

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Physics 2A Lecture 9: Jan 28 Vivek Sharma UCSD Physics
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Announcements • This week, read Chapter 4 and Chapter 5.1, next week is all chapter 5+ lots of problem solving • Do as many End-Of-Chapter discussion/exercises/problems as you can • I will be traveling to Washington DC Feb7- 10 on National Science Foundation business. The Friday Feb 8 th lecture will be conducted by three spectacular grad students who have taught this course before. –Their jokes are also funnier
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•Kinematics: Language for describing motion •displacement, velocity, acceleration •Dynamics: –Cause of change in motion •New Concepts : Force and Mass •Newton’s Three Laws of Motion –Obtained from first principles Fundamental – Based on experimental observations of motion, NOT product of some math derivation
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A Flea driven Rickshaw Cart ! Maria Cardosa (Columbia) created a circus of trained fleas. She used sound (rock music?) and CO 2 to get Brutus the flea to hop. When Brutus hops, the cart jerks thru a distance of 1cm. Mass of cart is 160,000 times mass of flea Brutus is the strongest (forceful) flea on earth !!
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The Force Vector • Force is a push or pull on some object • Gives quantitative description of interaction between an object(s) & its environment – i.e: pulling a box • Force is a vector: – has direction and magnitude – SI unit of magnitude is the Newton (N) – Force of gravitational attraction that earth exerts on your body is your weight
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Typical Force Magnitude
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Instrument For Measuring Forces Spring balance is coil spring attached to a pointer When force applied Æ spring stretches some. Amount of stretch directly proportional to force PULL PUSH
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Superposition of Forces 2 n1 1 et 2 When two forces & act simultaneously on an object, experiments show that the net effect on object's motion is same as effect of
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This note was uploaded on 05/08/2008 for the course PHYS 2A taught by Professor Hicks during the Winter '07 term at UCSD.

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9lecture2a08 - Physics 2A Lecture 9: Jan 28 Vivek Sharma...

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