Lecture Notes Chapter2

Lecture Notes Chapter2 - 9/9/2008 Chapter 2 Motion in One...

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9/9/2008 1 1 " The kinematics of motion in one dimension " Problem-solving strategies " Free fall Chapter 2 Motion in One Dimension Topics: 2 Different Descriptions of Motion Motion diagram (student walking to school) Table of data Graph 3 Interpreting Graphs Velocity = slope of position-vs-time graph = rise / run v = D x D t = x f - x i t f - t i 4 Uniform Motion Straight-line motion with equal displacements during any successive equal-time intervals L motion with constant velocity v = D x D t = x f - x i t f - t i x = v D t x f = x i + v D t Demo: Motion sensor and Ramp At what point is the object moving fastest, stopped, speeding up, slowing down. etc. 6 Here is a motion diagram of a car moving along a straight stretch of road: Which of the following position-versus-time graphs matches this motion diagram? Position-vs-time graph question A. B. C. D.
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9/9/2008 2 Here is a motion diagram of a car moving along a straight stretch of road: Which of the following velocity-versus-time graphs matches this motion diagram? Checking Understanding A. Slide 2-13 B. C. D. 8 Sue moves according to the plot. What are her instantaneous velocities at t MOTION IN ONE-DIMENSION 9 A student drives along a straight road according to the plot. 1) True or 2) False : At t = 7 s the student is back at the same position she started from? 1. True 2. False Checking Understanding Slide 2-15 A graph of position versus time for a basketball player moving down the court appears like so: Which of the following velocity graphs matches the above position graph? A. B. C. D. A graph of velocity versus time for a hockey puck shot into a goal appears like so: Which of the following position graphs matches the above velocity graph? Checking Understanding A. B. C. D. Slide 2-17 Demo: Motion sensor and person walking Can you match the graph
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9/9/2008 3 13 Which velocity vs time plot below might represent the velocity of a cart projected up a hill which comes to a stop and rolls back down? 1. 1 2. 2 3. 3 4. 4 5. 5 6. 6 v t v t v t #1 #2 #3 #4 #5 #6 v t v t v t 14 Which velocity vs time plot below might represent the velocity of a cart projected up and over a hill? Like a rollercoaster ride where the cart just makes it over the top. 1. 1 2. 2 3. 3 4. 4 5. 5 6. 6 v t v t v t #1 #2 #3 #4 #5 #6 v t v t v t 15 Motion with Changing Velocity (Part 1) " Average Velocity Can compute ratio between displacement and time interval for any pair of initial and final points i.e. constant velocity an object would have to travel to achieve the same displacement over the same time interval v = D x D t = x f - x i t f - t i 16 " Instantaneous Velocity Same calculation as before but over a very short time interval
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This note was uploaded on 10/12/2008 for the course PHYSICS 131 taught by Professor Hatch during the Spring '07 term at UMass (Amherst).

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Lecture Notes Chapter2 - 9/9/2008 Chapter 2 Motion in One...

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