o.o sigdg 8± - mr.neave's...
TRANSCRIPT
Pg 30
# 10 .V
, = 6. one [ [ ]
Vz -
. 7 . 3mg [ w ]
at = O.O 94 s2
sigdg= 8±
*
= 7.3÷ [w] - 6.0 ;fE]
÷ 945= 7.33 [ w ] + 6.0 m [ D
to
8=13.3z[w÷
094 s
Er = 141mg , [ w ]
at = / 40 mg [ w ]
Pg 30 # 5
V ,= 10 Ys [ N
Vz = 10 mls [ ST* Acceleration is a change in speed
OR direction
UNIT #1 KINEMATICS The Big 5
Uniform Acceleration
� acceleration is constant
� 5 Kinematic equations...much easier than graphical analysis!
Equation #1
� v-t graph, straight line (uniform acceleration)
� Δd = area under graph Δd=Atriangle + Arectangle
A- .
bh÷tense.Vz .Vw2
A÷st #,
An vi at
Id=th¥ at tv ,at
Eds 'r⇐) at + v , at
= ⇐⇒ at +2£ at
= '⇐€vpattv , At
= that tau ,at tv
,at
= tgvz at ttv ,at
= to at ( k th )Id = (Et¥ at
Equation #2
� we know that
� we can say,
� rearranging, we get
→ >aat=v . IFtaat . Es
Equation #3
� we can use equations (1) and (2) to derive equation (3)
(1) (2)
→ isd
.fntsaI)#sorzgbtetagtlEd =P, at ttsaat
The Big Five
Equation Missing Variable
(1)
(2)
(3)
(4)
(5)
pg -
37
Examples
1. A car accelerates at 3m/s2 from rest for 10s. How far does it travel?
2. A car is moving at 100km/h. It stops in 5.0s.
What is the car’s acceleration?
3.0 mlsh 10.05
: =0 mlsloookmk
1. GRASS
I . Given: Vi . Omls
V¥a =3
.com/s2si2sig
At = laosdigs
ad = ?
Reidy ad
Analysisad=Yatt£aaE
Stepsaol.to#iiosttEoaDfo.oj/d=o+tsL3oOs*1oosYDd=150m
* 2 Given v ,= 100.0km/h
k= 0ms( stopped)
AtisosezsigRequired : £
dis'
-aDt4=27.8 }l 0=27.8 ztalsos)sssigdigsh C5.07%2385.465%2
Homework
� Read 1.5
� p.39#1-6