{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

_Lect02_ppt_

# _Lect02_ppt_ - Physics 112 Lecture 2"Mechanics for...

This preview shows pages 1–7. Sign up to view the full content.

Physics 112: Lecture 2, Pg 1 Physics 112: Lecture 2 “Mechanics for Physicists and Engineers” Agenda for Today ± 1-D Kinematics ± Average & instantaneous velocity and acceleration ± Motion with constant acceleration

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Physics 112: Lecture 2, Pg 2 Motion in 1 dimension ± In 1-D, we usually write position as x(t). ± Since it’s in 1-D, all we need to indicate direction is + or ± . ² Displacement in a time ² t = t 2 - t 1 is ² x = x(t 2 ) - x(t 1 ) = x 2 - x 1 t x t 1 t 2 ² x ² t x 1 x 2 some particle’s trajectory in 1-D
Physics 112: Lecture 2, Pg 3 1-D kinematics t x t t ) t ( x ) t ( x v 1 2 1 2 av ± ± = ² ² ³ t x t 1 t 2 ± x x 1 x 2 trajectory ± Velocity v is the “rate of change of position” ± Average velocity v av in the time ± t = t 2 - t 1 is: ± t V av = slope of line connecting x 1 and x 2 .

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Physics 112: Lecture 2, Pg 4 ± Consider limit t 1 t 2 ± Instantaneous velocity v is defined as: 1-D kinematics... dt ) t ( dx ) t ( v = t x t 1 t 2 ± x x 1 x 2 ± t so v(t 2 ) = slope of line tangent to path at t 2 .
Physics 112: Lecture 2, Pg 5 Puzzle Yesterday I was driving down Green Street, when I was stopped by a police officer. He said to me “You were going 60 miles an hour.” I responded, “I’ve only been driving for 10 minutes! How could I possibly have gone 60 miles an hour, when I haven’t even been traveling for an hour?” What’s wrong with my argument?

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Physics 112: Lecture 2, Pg 6 ± Graph of x(t) versus time, what’s the average velocity?
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 25

_Lect02_ppt_ - Physics 112 Lecture 2"Mechanics for...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online