Lecture04

# Lecture04 - PHYSICS 220 Lecture 04 Kinematics Dynamics...

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Lecture 4 Purdue University, Physics 220 1 Lecture 04 Kinematics + Dynamics Textbook Sections 3.3 - 3.5, 4.1-4.2 PHYSICS 220

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Lecture 4 Purdue University, Physics 220 2 Overview Last Lecture – Position: your coordinates – Displacement: Δ x = change of position – Velocity: rate of change of position average : Δ x/ Δ t instantaneous: slope of x vs. t – Acceleration: rate of change of velocity • average: Δ v/ Δ t instantaneous: slope of v vs. t • Today – More on Kinematics – Dynamics
Lecture 4 Purdue University, Physics 220 3 Tossed Ball • Draw v vs t A ball is tossed from the ground up a height of two meters above the ground and falls back down. v v v -2 -2 t 4 3 -2 t 4 3 -2 t 4 3 -2 v t 4 3 v t 4 3 A B C D E y x

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Lecture 4 Purdue University, Physics 220 4 Tossed Ball • Draw v vs t • Draw y vs t • Draw a vs t v t y t a t A ball is tossed from the ground up a height of two meters above the ground and falls back down.
Lecture 4 Purdue University, Physics 220 5 Not 0 since V f and V i are not the same ! = 0 A ball is thrown straight up in the air and returns to its initial position. During the time the ball is in the air, which of the following statements is true? A) Both average acceleration and average velocity are zero. B) Average acceleration is zero but average velocity is not zero. C) Average velocity is zero but average acceleration is not zero. D) Neither average acceleration nor average velocity are zero. V ave = Δ y/ Δ t = (y f – y i ) / (t f – t i ) a ave = Δ v/ Δ t = (v f – v i ) / (t f – t i ) Question

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Lecture 4 Purdue University, Physics 220 6 Direction of Acceleration In 1-D cases, if speed is increasing , v and a are in same direction; If speed is decreasing , v and a are in opposite direction. a is in the same direction of Δ v
Lecture 4 Purdue University, Physics 220 7 Where is velocity zero?

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