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# l1 - Announcements HW#1 is due next Wednesday by 8am...

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ISP209s10 Lecture 1 -1- Announcements • HW #1 is due next Wednesday by 8am. • Textbook – Hobson, “Physics Concepts & Connections” 4th ed – Not 100% essential, but it is very useful • Honors Option and overrides • Please check corrected reading assignment • link to website available in LON-CAPA www.nscl.msu.edu/~bogner/isp209s2010/

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ISP209s10 Lecture 1 -2- Today • Basic Concepts of Motion – Position, velocity, acceleration, relative motion,… • What is Time? • Einstein and the relativity of Time – Time travel • Loose ends from 1st class – What is Science? What is Pseudo-Science? Significant Figures – If I don’t get to this, please consult the notes and textbook to flesh it out on your own. It’s standard stuff you probably learned in HS.
ISP209s10 Lecture 1 -3- Boring but necessary preliminaries: Motion Position – location in space relative to an origin. Velocity – rate of change of position Acceleration – rate of change of velocity t x t t x x v i f i f ! ! = " " = = in time change ing correspond position in change in time change ing correspond y in velocit change = a

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ISP209s10 Lecture 1 -4- Example – Position of a ball at different times 5 2.0 4 3.0 3 3.0 2.5 2.5 2 2 1 1 0 0 t (s) x (m) What is the average velocity between 1 and 2 s? s m s m s s m m t x v / 1 1 1 1 2 1 2 = = ! ! = " " = What is the average velocity between 2 and 2.5 s? s m s m t x v / 1 5 . 0 5 . 0 = = ! ! =
ISP209s10 Lecture 1 -5- Example 5 2.0 4 3.0 3 3.0 2.5 2.5 2 2 1 1 0 0 t (s) x (m) What is the average acceleration at 1 s? 2 / 0 1 / 1 / 1 s m s s m s m t v a = ! = " " = What is the average acceleration at 4 s? -1 0 1 1 1 1 v ( m/s) 2 / 1 1 / 0 / 1 s m s s m s m t v a ! = ! ! = " " =

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ISP209s10 Lecture 1 -6- Relative Motion with Mort and Velma Velma rides a train that is going 50 m/s relative to Mort Velma throws a baseball at a speed 20 m/s (relative to herself ) towards the front of the train From Mort’s perspective, how fast is the baseball going?
ISP209s10 Lecture 1 -7- Relative Motion with Mort and Velma Velma rides a train that is going 50 m/s relative to Mort Velma throws a baseball at a speed 20 m/s (relative to herself ) towards the front of the train From Mort’s perspective, how fast is the baseball going? Ans: 50 + 20 = 70 m/s This is common sense. The velocities of the train and ball add. We call it “Galilean” or “Newtonian” relativity .

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ISP209s10 Lecture 1 -8- A Relative Motion 4JNVMBUJPOT http://mysite.verizon.net/vzeoacw1/velocity_composition.html (Your computer needs a (free) Adobe Shockwave Plug-In) If you make the boat go in the same direction as the water, then it’s analogous to the train example w/Velma and Mort: Speed of baseball seen by Mort <==> Speed of boat seen from shore Speed of train seen by Mort <==> Speed of water seen from shore
ISP209s10 Lecture 1 -9- Relative Motion with Mort and Velma If Velma were to do physics experiments on the train, and Mort on the platform, we would expect them to observe the same laws of physics as long as

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l1 - Announcements HW#1 is due next Wednesday by 8am...

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