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### PHYS16 – Lecture 5

Lingenfelter Corvette

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
- Due Sunday, Written homework, Math Exam, & Ch. 3 Online homework

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

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

Derive Kinematic Equations for Constant Acceleration

Derive Kinematic Equations

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?

Free Fall – What does it imply?

- Demo: Falling Balls
- Demo: Feather vs. Penny

http://panda.unm.edu/demos

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!

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

Lingenfelter – 0 to 60 mph in 1.97 s

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…

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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