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PHYS16 – Lecture 4

PHYS16 – Lecture 4. Physics of 1D Motion September 15, 2010. Agenda. Administration Key Concepts – Physics 1D motion Displacement, Velocity, & Acceleration. Administration. Clickers, Textbook, Connect Math Exam Look at messages Due Sunday Homework Assignments Lab homework due today

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PHYS16 – Lecture 4

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

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

  3. Administration • 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…

  4. 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

  5. Define Terms

  6. 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

  7. 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

  8. Acceleration • Acceleration • Final velocity minus initial velocity divided by time, both a magnitude and a direction • How much an object speeds up or slows down Position graph where acceleration is not 0 http://physics247. com

  9. 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)

  10. Observe and Report – Use a Graph

  11. Demo: Remote Control Car http://familycourtchronicles.com

  12. 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

  13. Use Math

  14. Demo: Determine x, v, & a mathematically! X V A

  15. Determine v • x=3t2 +4t -5 • v=6t+4 • a=4t2+3t+5 • v=(4/3)t3+(3/2)t2+5t+v0 • laksdj

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

  17. 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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