Chapter 2 fizik

8/7/2019 Chapter 2 fizik

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By the end of this lesson, you should beable to:

D efine distance and displacement D efine speed and velocity D efine acceleration and deceleration Calculate speed and velocity Calculate acceleration and deceleration.


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D istance: The total length travelled fromone location to another location.

Jarak ialah jumlah panjang yang dilalui darisatu tempat ke satu tempat yang lain.

Jumlah panjang lintasan yang dilalui olehobjek itu.

Jumlah panjang diantara dua titik.


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D isplacement: The distance betweentwo locations measured along the

shortest path connecting them. J arak terpendek antara dua tempat yang

dilalui oleh objek itu. J arak objek dari satu titik rujukan.


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A man walk 5 m to the east, 3 msouth, 5 m west and finally 3 m north.

a) What is the total distance?b) What is the displacement?


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Speed is a distance travelled per unittime or the rate of change of distance.

Laju ialah jarak yang dilalui per unit masaatau kadar perubahan jarak

Average speed,

v= Total distance,

s(m)

Time, t (s)


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V elocity is the speed in a given direction or the rate of change of displacement

H alaju ialah laju yang mempunyai arah ataukadar perubahan sesaran.

Average velocity,

v= Total displacement,

s(m)

Time, t (s)


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Both speed and velocity have the sameSI unit.

Kedua-dua laju dan halaju mempunyai unit

SI yang sama. They are measured in metres per second

or m s -1. Ia diukur dalam meter per saat atau m s -1.


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A long distance runner ran 8 km southand then 10 km east. If the run took him 3 hours,

a) What was his average speed?b) What was his average velocity?


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If an object moves with increasingvelocity, we say that the object

experiences acceleration. Sesuatu objek yang mengalami perubahan

halaju yang menaik, kita katakan objek itumengalami pecutan.


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A cceleration is the rate of change ofspeed.

P ecutan ialah kadar perubahan halaju.

A cceleration, a = Change of velocity, v (ms -1)Time, t (s)

= Final velocity initial velocity

Time, t (s)a = v u

t


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If an object moves with decreasingvelocity, we say that the object

experiences deceleration. Sesuatu objek yang mengalami perubahan

halaju yang menurun, kita katakan objek itumengalami pecutannegatif atau nyahpecutan.


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1. A car increase its velocity steadily from72 km/h to 108 km/h in 5 s. What is itsacceleration in m/s 2?

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n object moves from rest with a uniformacceleration of 2ms -2. What is thevelocity of the object after 30 s?

3. A car moving at a constant velocity of30ms -1 came to a stop 6 s after its brakeswere applied. What was thedeceleration of the car?


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v = u + at s = ut +1/2 at 2

v2 = u 2 + 2 as s = (u + v)/2 . t


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A skateboarder in a race is travelling at10 m s -1 as he crosses the finishing line. He

then decelerates uniformly until comingto rest over a distance of 20 m

What is his acceleration as he pulls up? How long does he take to come to rest?

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Chapter 2 fizik