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PHYS16 – Lecture 4 Physics of 1D Motion September 15, 2010

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Administration Key Concepts – Physics 1D motion Displacement, Velocity, & Acceleration Agenda

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Clickers, Textbook, Connect Math Exam – Look at messages – Due Sunday Homework Assignments – Lab homework due today – Written homework due Friday 2.38 – displacement not distance Labs – Partners… Administration

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Key Concepts: Physics 1D Motion Displacement, Velocity, & Acceleration – Know the definitions of these terms – Know how they are related Motion with Constant Acceleration – Solve for constant accel. get Kinematic Eqs. – Use the Kinematic Eqs. to solve problems Race Car Free Fall

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Define Terms

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Displacement Displacement vs. Distance – Displacement = final position – initial position with both magnitude and direction – Distance = total position traversed from final position to initial position, just magnitude

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Velocity Velocity vs. Speed – Velocity – final position minus initial position divided by time, both magnitude and direction – Speed – how fast you are going, just magnitude 60 mph

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Acceleration – Final velocity minus initial velocity divided by time, both a magnitude and a direction – How much an object speeds up or slows down com Position graph where acceleration is not 0

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Questions: A=Yes, B=No Can displacement be zero and distance be positive?(Yes) Can distance ever be negative?(No) Can speed ever be negative?(No) Can acceleration be negative?(Yes) Can an object that is stopped at t=0 have an acceleration?(Yes) If an object is traveling at a constant velocity can it have an acceleration?(No)

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Observe and Report – Use a Graph

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Demo: Remote Control Car

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Demo: Remote Control Car Draw the position vs. time, velocity vs. time, and acceleration vs. time graph for each situation – Constant velocity – Constant velocity forward then constant velocity backward – Constant acceleration

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Use Math

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Demo: Determine x, v, & a mathematically! XVAXVA

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Determine v x=3t 2 +4t -5 – v=6t+4 a=4t 2 +3t+5 – v=(4/3)t 3 +(3/2)t 2 +5t+v 0 – laksdj

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Summary Displacement vs. Distance Velocity vs. Speed Acceleration Know how to interconvert between them!

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For Next Time… Online lab homework due Wednesday Written homework due Friday Online Math Exam due Sunday Lab this week! Pick 3 partners!

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