# Lecture3 - PHYSICS 231 INTRODUCTORY PHYSICS I Lecture 3 •...

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Unformatted text preview: PHYSICS 231 INTRODUCTORY PHYSICS I Lecture 3 • HW 2 due: Wednesday Jan 23 @ 3:59 am • (MLK Jr. Day on Jan 21) • Note: related reading for each lecture listed on Calendar page at PHY 231 website Announcement Main points of last lecture • Acceleration defined: • Equations with constant Acceleration: ( Δ x , v , v f , a , t ) • Acceleration of freefall: a = v f ! v i t basicequations: 1) v = v + at 2) ! x = 1 2 ( v + v ) t 3) ! x = v t + 1 2 at 2 4) ! x = v f t " 1 2 at 2 5) a ! x = v f 2 2 " v 2 2 a " ( # g ) = # 9.81m/s 2 Example 2.9a A man throws a brick upward from the top of a building. (Assume the coordinate system is defined with positive defined as upward) At what point is the acceleration zero? A C D A C D B E a) A b) B c) C d) D e) None of the above Example 2.9b A man throws a brick upward from the top of a building. (Assume the coordinate system is defined with positive defined as upward) At what point is the velocity zero? A C D A C D B E a) A b) B c) C d) D e) None of the above CHAPTER 3 Two-Dimensional Motion and Two-Dimensional Motion and Vectors Vectors Scalars and Vectors • Scalars: Magnitude only...
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Lecture3 - PHYSICS 231 INTRODUCTORY PHYSICS I Lecture 3 •...

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