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## lec5

by: Usman Qureshi

19

0

2

# lec5

Marketplace > lec5
Usman Qureshi
AASU
GPA 2.8

No professor available

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lec5
COURSE
PROF.
No professor available
TYPE
Study Guide
PAGES
2
WORDS
KARMA
50 ?

## Popular in Department

This 2 page Study Guide was uploaded by Usman Qureshi on Wednesday November 18, 2015. The Study Guide belongs to a course at a university taught by a professor in Fall. Since its upload, it has received 19 views.

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Date Created: 11/18/15
QSit in your assigned seats Make sure you are using the correct PRS unit to answer questions 3 Last Lecture 3Freebody diagrams 3Today 3Kinematics describing 1D motion 3Relative velocity yes more vectors 3 Important Concepts OChangederivativeslope 3Think carefully about directions changes the sign Important Reminders 3 Finish Mastering Physics 2 tonight before 10pm 3 Mandatory tutoring sessions start this week QOffice hours posted 3 Pset 2 due this Friday Kinematics Description of Motion 3AM measurements require an origin a coordinate system and units 3Next complication is reference frame the term used to describe the motion of observer aConstant velocity is OK accelerated observer is not 3 Basic definitions 3Position 3Distance versus displacement 3Velocity change of position OSpeed is the magnitude of velocity 3Acceleration change of velocity Relative Velocity 3 Basic concept 30bserver B sees a moving object A and QObserver B is moving relative to observer C so 3What does observer C see for the motion of the object 3Notation use wrt to indicate with respect to gt gt gt VAwrt VAwrt VBwrt C B C You 3Example Aball Bme Cyou VAB sic t 18 VBC Key Kinematics Concepts 3Changeslopederivative dx dvx dzx v a 2 x dt x dt dt 3velocity is the slope of position vs t acceleration is the slope of velocity vs t and the curvature of position vs t 3Even in simple 1D motion you must understand the vector nature of these quantities 3 Initial conditions 3All formulas have assumptions One Important Special Case Constant Acceleration a x 2 vt OPhysics 0 Initial conditions Multibody Kinematics Problems 3 Need to use consistent coordinate system and origin for all objects 3 Need to think carefully about directions signs 3 Need to think carefully about initial conditions especially when things start at different times 3Write separate equations for each object 3Read problem carefully to understand the specific constraint to use to solve Summary 3Kinematics provides a language to describe motion 3 Basic relationship between position velocity acceleration changeslopederivative 3Study special cases like constant acceleration but understand the assumptions that go into all formulas 3 Position velocity and acceleration are ALL vectors and need to be manipulated using either arrows qualitative or components quantitative 3 Directions or signs in 1D of position velocity and acceleration can all be different

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