reprot physics. momentum

7/23/2019 Reprot Physics. Momentum

1/23

MOMENTUM & IMPULSE

2:30 4:00/ MW

Physics Lecture 1

Engr. Romeo G. Tgu!ino


2/23

The s"orts nnouncer sys# $Going into the

!!%str &re'# the (hicgo White )o* h+ethe momentum.$ The he,!ines ,ec!re

$(hicgo -u!!s Gining Momentum.$ The

cochpumps u" his tem t h!%time# sying

$ou h+e the momentum the critic! nee, istht you use tht momentum n, &ury them

in this thir, urter.$

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3/23

Wht is Momentum5

Momentumis common!y use, term ins"orts. 6 tem tht hs the momentum is

onthe mo+e n, is going to t'e some eort

to sto". 6 tem tht hs !ot o momentum is

re!!y on the mo+e n, is going to &e hr, to

sto". Momentum is "hysics term it reers to

the untity o motion tht n o&7ect hs. 6

s"orts tem tht is on the mo+e hs themomentum. 8 n o&7ect is in motion 9on the

mo+e then it hs momentum.

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4/23

Momentum is +ector untity tht is the

"ro,uct o the mss n, the +e!ocity o n

o&7ect or "rtic!e. The stn,r, unit omomentum mgnitu,e is the 'i!ogrm%meter

"er secon, 9'g ; m/s. 6!ternti+e!y# the grm%

centimeter "er secon, 9g ; cm/s cn &e use,

to e*"ress momentum mgnitu,e. The,irection o momentum +ector cn &e

e*"resse, in +rious


5/23

Momentum cn &e ,eine, s $mss in

motion.$ 6!! o&7ects h+e mss so i n o&7ect is

mo+ing# then it hs momentum % it hs its mssin motion. The mount o momentum tht n

o&7ect hs is ,e"en,ent u"on t


6/23

8n "hysics# the sym&o! or the untity

momentum is the !o


7/23

The units or momentum m/sis the stn,r, metric unit o momentum#

there re +riety o other units tht re

cce"t&!e 9though not con+ention! units o

momentum.Examples includes:

'g>mi/hr# 'g>'m/hr# n, g>cm/s.

8n ech o these e*m"!es# mss unit ismu!ti"!ie, &y +e!ocity unit to "ro+i,e

momentum unit. This is consistent


8/23

Momentum: ?ector @untity

Momentum is vecto !uantity. 6s ,iscusse, inn er!ier !esson# +ector untity is untity

tht is u!!y ,escri&e, &y &oth mgnitu,e n,

,irection. To u!!y ,escri&e the momentum o A%

'g &o

mgnitu,e n, the ,irection o the &o

is not enough to sy tht the &!! hs 10 'g>m/s o

momentum the momentum o the &!! is not u!!y,escri&e, unti! inormtion &out its ,irection is

gi+en. The ,irection o the momentum +ector is

the sme s the ,irection o the +e!ocity o the

&!!.

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9/23

LetBs Prctice

1. 6 1200 'g cr ,ri+es


10/23

6ns


11/23

6ns


12/23

Wht is 8m"u!se5

The impulseo orce 9!so mesure, in/s is eu! to the chnge in momentum o

&o,y


13/23

LetBs Prctice

1. 6n o&7ect tr+e!s


14/23

6ns


15/23

vmFt =

IMPULSE CHANGE IN MOMENTUM

This theorem revealssome interestingrelationships such asthe INE!SErelationship "et#een$O!CE an% TIME

t

vmF

=

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SI

CS

8m"u!se Momentum

Re!tionshi"


16/23

VmfT =

Constant

Since TIME is %irectl&relate% to the ELOCIT'#hen the (orce an% massare constant) the LONGE!the cannon"all is in the

"arrel the greater thevelocit&*

Also) &ou coul% sa& that the(orce acts over a larger

%isplacement) thus there ismore +O!,* The #or- %one

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CS

Impulse MomentumRelationship


17/23

These conce"ts re mere!y n outgro


18/23

8 &oth si,es o the &o+e eution re mu!ti"!ie, &y

the untity t# ne< eution resu!ts.

+ t = m ,v

This eution re"resents one o t


19/23

Re"resenting Re&oun,ing

(o!!isiono< consi,er co!!ision o tennis &!!


20/23

Drom the re"resenttion 9+ector ,igrm# +e!ocity%

time gr"h# n, tic'er t"e "ttern# in,icte


21/23

Answer6.The +e!ocity chnge is gretest in case . The

+e!ocity chnges rom K30 m/s to %2 m/s. This is chnge o A m/s 9% n, is greter thn in cse 6 9%

1A m/s.

-.The cce!ertion is gretest in case . 6cce!ertion

,e"en,s on +e!ocity chnge n, the +e!ocity chngeis gretest in cse - 9s stte, &o+e

(.The momentum chnge is gretest in case .

Momentum chnge ,e"en,s on +e!ocity chnge n,

the +e!ocity chnge is gretest in cse - 9s stte,&o+e.

J.The im"u!se is gretest in case . 8m"u!se eu!s

momentum chnge n, the momentum chnge is

gretest in cse - 9s stte, &o+e.

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22/23

Mem&ers

Jnie!!e ose"h I. -u&n(mi!!e . Rmos

ico!s Recto

erric 6. Ju!guimeJune Je Rm

Engr. Romeo G. Tgu!ino2:30 4:00/ MW

Physics Lecture 1

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23/23

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