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7/23/2019 6 1 Circular Motion
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Round and Round
6-1 Circular Motion
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7/23/2019 6 1 Circular Motion
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If this is true, why does ANYTHING
o!e in a circle"
t
dv
= CIRCUMFERENCE
C = 2r = d
PERIOD (T)
Time for one revolution
T
r
vc
2
=
#$%ects tra!elin& in circular otionha!e constant s'eed and
constantly
CHN!IN!!elocity ( chan&in& indirection $ut not
a&nitude
)nifor Circular Motion
How do we de*ne "E#OCIT$"
+elocity is TN!ENTto thecircle at all 'oints
hat t. are we tal/in& a$
hat d. are we tal/in& a$
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7/23/2019 6 1 Circular Motion
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Inertia causes o$%ects to tra!el%TRI!HT
0aths can $e $ent $y FORCE%
CENTRIPET# FORCE$ends an
o$%ect.s 'ath into a circle - 'ullin&toward the CENTER
Centri'etal orce
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7/23/2019 6 1 Circular Motion
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Misconce'tion
oors to the 2Gra!itron3 close and it starts to
re 'ushed a&ainst the outside ed&e of the rid
ed there, You ust $e e5'eriencin& 2centrif
ce3 throwin& you outward fro the ride Ri&
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7/23/2019 6 1 Circular Motion
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hat is really ha''enin&"As the Gra!itron starts to s'in,
friction $etween
your $ody and the ride start you o!in&
#nce you are o!in&,your $ody wantsto &o 7TRAIGHT
8 $ut you can.t8
The wall /ee's 'ushin& you $ac/ in towardthe centre of the
ride
!
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7/23/2019 6 1 Circular Motion
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centrifu&al 92centre :eein&3; force A *ctitious. or
inertial. force that is
e5'erienced fro IN%IDEa circularotion syste ( &HT $OU
FEE#
centri'etal 9centre see/in&; force
A true force that 'ushes or 'ulls ano$%ect toward the centre of
a circular
'ath ( &HT CTU##$ HPPEN%
hat is the sensation thatyou feel"
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7/23/2019 6 1 Circular Motion
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r
vac
2
=
Centri'etal Acceleration
Centri'etal force is aNET FORCE
CausesCCE#ERTION
In the %ME DIRECTION % NETFORCE
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7/23/2019 6 1 Circular Motion
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hat is the centri'etal accelerationof a toy $all on the end of a
14
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7/23/2019 6 1 Circular Motion
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r
vac
2
=
Centri'etal orce
m
Fa net
= maFnet =
cc maF =
r
mv
Fc
2
=
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7/23/2019 6 1 Circular Motion
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hat is the centri'etal force actin&on a =@@@ /ilo&ra
air'lane if it turnswith a radius of 1@@@ etres whileo!in& at
@@ eters 'er second"
ac> !=?r
ac> 9@@?s;=?1@@@
ac> D@ ?s=
5a'le B=
c> ac
c> 9=@@@ /&;9D@?s=;
c> 14E 5 1@FN
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7/23/2019 6 1 Circular Motion
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Is it 'ossi$le for a 1@@@ /ilo&ra car toa/e a turn with a
radius of F@ etreswhile o!in& at 1F etres 'er secondwith ru$$er
tires on dry as'halt"
c> !=?r
c> 91@@@ /&;91F ?s;=?
F@
c>
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7/23/2019 6 1 Circular Motion
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nd of 641
