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PHYS16 – Lecture 5

Lingenfelter Corvette. PHYS16 – Lecture 5. Free Fall and Race Cars: Constant Acceleration September 17, 2010. Too Good to be True???. http://Z06-corvette.com. Agenda. Administration Key Concepts – Physics 1D motion Constant Acceleration. Administration. Homework Assignments

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PHYS16 – Lecture 5

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  1. Lingenfelter Corvette PHYS16 – Lecture 5 Free Fall and Race Cars: Constant Acceleration September 17, 2010 Too Good to be True??? http://Z06-corvette.com

  2. Agenda • Administration • Key Concepts – Physics 1D motion • Constant Acceleration

  3. Administration • Homework Assignments • Due Sunday, Written homework, Math Exam, & Ch. 3 Online homework

  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 • Free Fall • Race Car

  5. What is constant acceleration? • Examples of a ≠ constant? • Bee flying • Dust Particle in the wind • Acceleration = constant (0 or some #) • Velocity can be approximated as linear • How many of these things have a=const? • Trains • People • Planes • Cheetahs • Automobiles

  6. Derive Kinematic Equations for Constant Acceleration

  7. Last time X V A

  8. Derive Kinematic Equations

  9. Free Fall

  10. Free Fall – Using the Equations • Constant acceleration is due to gravity • Drop a ball from 3 m, how long does it take to hit the ground?

  11. Free Fall – What does it imply? • Demo: Falling Balls • Demo: Feather vs. Penny http://panda.unm.edu/demos

  12. Free Fall – What does it imply? • Acceleration of any size or mass object should be the same • Penny should fall at the same rate as feather • This isn’t true due to air resistance • In vacuum it is true!

  13. Race Cars

  14. Lingenfelter Corvette • Can it really do 0 to 60 mph in 1.97 s? • Let’s calculate some #’s to see if it is reasonable http://Z06-corvette.com

  15. Lingenfelter – 0 to 60 mph in 1.97 s

  16. Stock Car – 0 to 333. 2 mph in ¼ mile

  17. C6 Corvette – 0 to 60 mph in 4.2 s

  18. Is it true? • Stock Car – 220,000 miles/hr2 • Lingenfelter Corvette – 110,000 miles/hr2 • C6 Corvette – 51,000 miles/hr2 • Yes, let’s look at some data from youtube…

  19. Summary • Most physical objects experience constant acceleration • Use Kinematic equations of Motion to solve for problems with constant acceleration • Examples: Free Fall and Race Car

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