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Straight motion
Let’s look the picture
Let’s look the picture
Old position
Let’s look the picture
Old positionNew position
New position
A
B
Can you tell me about rockets A and rockets B!
Old position
Let’s look the picture
Old positionNew position
New position
A
BWe can say, rocket A moving and B No !
Moving object is identified by its change of position from a certain point of reference
A change of position or displacement of an object from a certain point of reference is called MOTIONMOTION
In the lesson you are abble to :
1. Making a graph of displacement vs time
2. Finding the equation of speed
3. Identifying the application of constant straight motion in daily life
Science key word
1. Speed2. Velocity3. Acceleration4. Point of referent5. Motion6. Average speed7. Straight motion8. distance
Laju kecepatan Percepatan Titik acuan Gerak Laju rata-rata Gerak lurus perpindahan
Introduce
MotionMotion is a change of position or displacement of an object within a certain time interval
Various form of motion
Straight motionCircular motionParabolic motion
Point of referent is location which is considered fixed (at rest) and used to compare the initial and final position.
To understand how fast the object moves we have to know time needed to travel the distance of displacement.
Velocity Grahp
d (m)d2
d1
0 t1 t2 t (s)
distance (m) time (s)
d1 t1
d2 t2
Velocity Grahp
d (m)d2
d1
0 t1 t2 t (s)
Constt
d
t
d
2
2
1
1
This Constanta is Called
Velocity
VelocityVelocity is the change of position within a time interval
If distance (d), time interval (t) and velocity (v), we can write formula of velocity
t
dv
Velocity
t
dv
v
dt
The relationship among d, t, and v
tvd .v
dt
Velocity
d
The unit of velocity can be determine by unit of distance
divide by unit of timeIf unit of distance in SI is
meter, time interval is second, and velocity is meter per
second (m/s). In our daily life we usually use
km/h
Velocity
Velocity have two components :
1.Magnitude (absolute value) 2.Direction (arah)
Speed just have magnitude
VelocityBase on component that
contents of quantities, quantities can be derived in
two kind :1.Vector 2.Scalar
Velocity
For example1.If some one walking 5
km/hour toward east :a. his speed is 5 km/hourb. his velocity is 5 km/hour to east.
VelocityCalculating the velocityPada kenyataannya setiap object yang
bergerak kecepatannya selalu berubah (baik arah maupun nilainya)
Tidak mudah untuk memberikan contoh object yang bergerak dengan kecepatan tetap.
Untuk menjelaskannya digunakan konsep average speed (kecepatan rata-rata)
VelocityCalculating the velocityAverage speed is the total
traveled distance divided by the time needed to travel that distance.
t
dv
v = average speedd = total distancet = time total
Motion ber-sifat relatif Benda dikakatan bergerak atau
tidak tergantung dari titik acuan (point of reference) yang digunakan
For example Seseorang yang ber ada dipinggir
jalan akan melihat orang-orang yang berada di dalam mobil bergerak, tetapi antara penumpang dan sopir tidak bergerak.
Straight Motion
Straight motion is motion that have
Identify pleace!
Identify pleace!