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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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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

• Key Concepts – Physics 1D motion

• Constant Acceleration

• 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

X

V

A

### 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

### 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