PHYS16 – Lecture 5 Free Fall and Race Cars: Constant Acceleration September 17, 2010 Too Good to be True??? Lingenfelter Corvette

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PHYS16 – Lecture 5 Free Fall and Race Cars: Constant Acceleration September 17, 2010 Too Good to be True??? Lingenfelter Corvette

Administration Key Concepts – Physics 1D motion Constant Acceleration Agenda

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

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

Derive Kinematic Equations for Constant Acceleration

Last time XVAXVA

Derive Kinematic Equations

Free Fall

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

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!

Race Cars

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

Lingenfelter – 0 to 60 mph in 1.97 s

Stock Car – 0 to mph in ¼ mile

C6 Corvette – 0 to 60 mph in 4.2 s

Is it true? Stock Car – 220,000 miles/hr 2 Lingenfelter Corvette – 110,000 miles/hr 2 C6 Corvette – 51,000 miles/hr 2 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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