Main Ideas in Class Today

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1 Main Ideas in Class Toda Inroducion o Falling Appl Consan a Equaions Graphing Free Fall Sole Free Fall Problems Pracice:.45,.47,.53,.59,.61,.63,.69, Muliple Choice.1

2 Freel Falling Objecs Refers o objecs which are no held, bu are free o fall near he Earh s surface (oher cases Ch. 7) All objecs fall wih he same consan acceleraion due o grai in he absence of air resisance!

3 No Air on he Moon When Asronau Daid Sco dropped a feaher and a hammer on he moon, which hi he ground firs?

4 + Acceleraion Due o Grai We can ofen ignore air resisance, which picall has a small effec (excepions: feahers, parachues, big surface area/weigh). Acceleraion due o grai poins owards he ground (owards he cener of Earh) Magniude is g = 9.8 m/s near he surface of Earh In free fall, a = ± g depending he direcion is defined (I like o alwas define + as up) x o =100 m Wha does ha mean abou he sign of acceleraion, eloci and displacemen? Thus, in his figure, a, eloci and x are all negaie (wha happens if I flip +)! x f =0 m x = x f x o = 0 m 100 m = -100m

5 These are he onl formulas ou need for Used: To Ge: Tes 1 and he will be gien! besides rig a f f i i o a x o 1 a o ax In free fall, he onl acceleraion is due o grai: a=g (consan) We also generall use insead of x (because erical moion) x f f x i i Deried in book, bu ou don need o know how o derie hese formulas o Aerage of numbers + Define down o use a=+g Define up o use a= -g + o g o 1 g o g Same formulas jus differen leers A lo of confusion abou phsics is jus due o calling he same hing b differen leers

6 A baseball is hrown up in he air a an iniial eloci of.0 m/s. (a) How high up does i go? (b) How long is i in he air if ou cach i a he same heigh ou iniiall le go of he ball? a o x o 1 a o ax

7 Same sle as some concepual quesions on he es If ou oss a ball upward wih a cerain iniial speed, i falls freel and reaches a maximum heigh h. B wha facor mus ou increase he iniial speed of he ball for i o reach a maximum heigh 4h? a o x o 1 a o ax Jus because i s a concepual problem, doesn mean ou can use numbers.

8 No Talking This Time! A ball is ossed sraigh up ino he air. Which of he following represens he signs ( ) of he acceleraion as i moes upward, reaches is highes poin, and falls back down? Moing upward Highes poin Falling back down A B C D. None of hese Q15

9 (displacemen) ( eloci) + Graphing Freel Falling Bodies a = -g = -9.8 m/s Equaion of a sraigh line mx b ground x m is slope, b is -inercep 10 o o 1 g o g

10 You Ma Talk This Time A ball is ossed sraigh up ino he air. Which of he following represens he signs ( ) of he acceleraion as i moes upward, reaches is highes poin, and falls back down? Moing upward Highes poin Falling back down A B C D. None of hese Q16

11 + Acceleraion Due o Grai Acceleraion due o grai poins owards he ground (owards he cener of Earh) Magniude is g = 9.8 m/s near he surface of Earh In free fall, a = ± g depending he direcion is defined NOT ON WHICH DIRECTION YOU ARE GOING! x o =100 m x f =0 m

12 Common misconcepion ha a=0 a op of pah 10 5 o o 1 g a 9.8 m/s 10 5 o g Noe: is a maximum a he same insan when = 0 a (m/s ) Noe: a = -9.8 m/s alwas, een a op of he rajecor!

13 If ou drop an objec in he absence of air resisance, i acceleraes downward a 9.8 m/s. If insead ou hrow i downward, is downward acceleraion afer release is A. less han 9.8 m/s. B. 9.8 m/s. C. more han 9.8 m/s. Q17

14 A small bag is released from a helicoper ha is descending seadil a 1.50 m/s. (a) Afer 4.00 s, wha is he speed of he bag? (b) A 4 s, how far is i below where i was when i was dropped? (c) Wha are our answers o pars (a) and (b) if he helicoper is rising seadil a 1.50 m/s? Noice ha a change of he sign of eloci affecs he answer!

15 Concepual Problem A person sanding a he edge of a cliff hrows one ball sraigh up and anoher ball sraigh down a he same iniial speed. Neglecing air resisance, which ball will hi he ground below he cliff wih he greaer speed? a o x o 1 a o ax Jus because i s a concepual problem, doesn mean ou can use a formula o help ou hink abou i.

16 Figuring Ou Which Formula (main formulas gien on exam) x f f x i i x x x o o 1 a o ax o Eq. A Eq. B Eq. C Eq. D a Lis our knowns and unknowns: consan eloci x, o,, a o,, a, Someimes easier o find which formula does no hae he ariable ou are NOT considering Same sraeg applies o mulipar quesions, ou jus do one par a a ime. Someimes need answer from a o answer b

17 Clicker Answers Chaper/Secion: Clicker #=Answer Ch.C: 15=C, 16=C, 17=B

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s in boxe wers ans Put

s in boxe wers ans Put Pu answers in boxes Main Ideas in Class Toda Inroducion o Falling Appl Old Equaions Graphing Free Fall Sole Free Fall Problems Pracice:.45,.47,.53,.59,.61,.63,.69, Muliple Choice.1 Freel Falling Objecs

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