Physics131_L02WI10

# Physics131_L02WI10 - P hysi cs 131 M echa ni cs L ectur e 2...

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Physics 131 - Mechanics Lecture 2 Motion January 6, 2010 Homeyra Sadaghiani

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October 24, 2010 Physics 131 - Lecture 2 2 Announcements HW#0 is due at 9 a.m. on Friday, January 8th. Class introduction is due Sunday January 10 th by midnight. The first Preflight is due on Friday 9 a.m.
Week Date L# Lecture topic Text reading HW 1 4-Jan 1 Description of course structure, SI units 6-Jan 2 Motion, position, velocity, acceleration HW#0 8-Jan 3 One-dimensional motion 2 11-Jan F1 Furlough (Constant acceleration -Tutorial)   13-Jan 4 Vectors HW#1     3 18-Jan H1 Holiday (Martin Luther King's Birthday)   20-Jan 6 Two- dimensional motion 4.1-3 (12 P) HW#2   22-Jan 7 Circular and relative motion 4.3-7 (14 P) 4 25-Jan 8 Force, mass, inertial frames 5.1-4 (11 P)   27-Jan 9 Newton’s first & second Law 5.5-7 (8 P) HW#3 29-Jan E1 EXAM 1- Chapters 1-4 October 24, 2010 Physics 131 - Lecture 2 3 Lecture Schedule We are here!

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October 24, 2010 Physics 131 - Lecture 2 4 Dimensions and Units
October 24, 2010 Physics 131 - Lecture 2 5 Dimensional Analysis (1) The period P P (T) of a swinging pendulum depends only on the length of the pendulum d (L) and the acceleration of gravity g (L/ T 2 ) ) . . Which of the following formulas for P P could be correct ? be correct ? Example : (a) (a) (b) (b) (c) (c) p = 2 p d g p = 2 p d g p = 2 p ( dg ) 2

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October 24, 2010 Physics 131 - Lecture 2 6 L × L T 2 ae è ç ö ø ÷ 2 = L 4 T 4 ¹ T Dimensional Analysis (2) Realize that the left hand side P has units of time ( T T ) . The right hand side must have the same units (a) (a) (b) (b) (c) (c) Try equation (a). Try equation (b). Try equation (c). p = 2 p ( dg ) 2 L L T 2 = T 2 ¹ T p = 2 p d g p = 2 p d g L L T 2 = T 2 = T
Motion, position, velocity, acceleration 10/24/10 Physics 131 - Lecture 2 7

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October 24, 2010 Physics 131 - Lecture 2 8 Scalars and Vectors Temperature = Scalar Quantity is specified by a single number giving its magnitude .
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Physics131_L02WI10 - P hysi cs 131 M echa ni cs L ectur e 2...

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