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. Administration Key Concepts – Physics 1D motion Constant Acceleration. Administration. Homework Assignments

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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
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