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## BASIC PHYSICS I

by: Carlotta Dare DVM

13

0

4

# BASIC PHYSICS I Physics 3A

Carlotta Dare DVM
UCI
GPA 3.68

Staff

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COURSE
PROF.
Staff
TYPE
Class Notes
PAGES
4
WORDS
KARMA
25 ?

## Popular in Physics 2

This 4 page Class Notes was uploaded by Carlotta Dare DVM on Saturday September 12, 2015. The Class Notes belongs to Physics 3A at University of California - Irvine taught by Staff in Fall. Since its upload, it has received 13 views. For similar materials see /class/201924/physics-3a-university-of-california-irvine in Physics 2 at University of California - Irvine.

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Date Created: 09/12/15
Physics 3A 1D Motion 39Kinematics study of the motion of objects without concern about what causes that motion 39D namics stud of relation between motion and its causes 3 39Start with one dimensional straight line motion 39Average Velocity 39 Consider the motion of the car in the following an mumWWW We Sw Mvhlew gum z m MD 330 am canwumarzunz by Raymund ii Sammy AH mums rzservun Shoup 7 33 Physics 3A 1D Motion What are the dimensions of v V ZwZL time T 39What are the units of v in SI system 39How do you specify the direction of v in 1D motion with plus or minus sign if Xf gt Xi then V is positive if X lt x then v is negative f 1 Shoup735 Physics 3A 1D Motion 39We de ne the average speed scalar as 21 where d is the distance traveled and At is the time interval during the movement 39We de ne the average velocity vector as quotdisplacement vector divided by the change in timequot X X AX 1 22 note that 1 depends on path but Z and thus Vi does not Shoup r 34 Physics 3A 1D Motion rise run 39Plotting the car39s data gives us 39Slope between to points on this graph gives us the average velocity v for example between A 8 B 5 VX52 m 30m 222 105 05 5 39In addition total displacement is the quotarea under the curvequot of a velocity versus time graph Do Example 21 III Axlim ZAXDliII1 ZvDAtD l AtaO D Atquot0 11 A AXNZ AXDZ vDAtD u Shoup r 36 Physics 3A 1D Motion IWhat if we want to know an objects velocity at an exact time compute object39s quotinstantaneous velocityquot IInstantaneous velocig v the velocity of an object at a speci c instant of time 00 IConsider ITake the limit 7 5 lim E x AM At 40 Iln calculus Shoup 7 37 Physics 3A 1D Motion 39What if the velocity is not constant gt Acceleration IWe define average acceleration as thequottime rate of changequot of velocity averaged over some time interval VT 7A 7 2395 x tf tj At I What are the dimensions of acceleration a length time2 I Measures how rapidly the velocity is changing ie a 2 ms2 means velocity is changing 2 ms in each second Shoup r 39 Physics 3A 1D Motion ISummary for constant velocity 1D I Displacement vector I Average velocity vector I Instantaneous velocity vector I Speed scalar d A t I Model for constant velocity CVXA t A X Xf Xj xf Xj 4va t settmg ti 0 Shoup 7 38 Physics 3A 1D Motion IJust like instantaneous velocity we can de ne instantaneous acceleration which is the acceleration at one instant in time t Maw axll no At 39 clt 26 IProperties of acceleration I Since its a derivative of velocity wrt time graphically its the slope of a velocity versus time plot at any point Shoup 7 40 Time s Physics 3A 1D Motion 39Properties of acceleration cont 39 Can also obtain acceleration from displacement vector 39 Match the graphs d 0 t I What is meant by quotde acceleration 5m 41 up Physics 3A 1D Motion IAnother equation comes from V versus t plot and that area under curve is displacement A xarea area square manglg 3 A x vxi A tvxf vmA C l 1 1 AXVK vxi 2 vmAt VxlvxiAt but AXvKAt so gmgvx v mt 29 Sh up743 Physics 3A 1D Motion 39Properties ofacceleration cont 39 Acceleration is a quotchange in velocity per unit timequot 39 but velocity has both magnitude and direction so 39 change in velocity s magnitude gt acceleration 39 change in velocity s direction gt acceleration 39 or both 39Consider constant acceleration lt r ax Constant aK a Shoup 7 4 Physics 3A 1D Motion 39Now for position versus time 39 reca FAXm AXX X Vvmvxi Xi X VminAtVxlinti tl w ti 0 Shoup 7 44 Physics 3A 1D Motion 39Now put in value of acceleration fovnaxt 1 xix vmv t XiXllelvxath 2 211 SW Physics 3A 1D Motion 39Summary smupaw Physics 3A 1D Motion 39Now we can pull out value of time vxfvmaxt V vm xfxlvmvxit ft Shoup 7 45 Physics 3A 1D Motion r39Your Mission gt Problem solving I 1 Draw a picture Mode Extract from quotwordsquot useful information Decide on concept ie constant acceleration select equations which use info you have and also info you want I 5 Solve for unknown 39 6 Adjust for signi th gures and include units no 03M lExample ofconstant acceleration gt Freefall Motion 39 We all know that objects released near earth fall freely toward earth39s center 39 Due to gravity see later lectures freeifalling objects undergo a constant acceleration vector pointed toward earth39s center with magnitude a y g 980ms2 32ftsZ Shoup 7 43

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