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Rasa satu daya ke atas / Feel an upward force
Bertambah / Increases
Bertambah / Increases
Semakin bertambah daya apungan
semakin banyak isipadu air
disesarkan
The higher the buoyant force the
larger the volume of water
displaced
Memecut / accelerates
W1 > W2
Berat objek dalam air lebih
rendah disebabkan daya apungan
dalam air. / Weight of object in
water is lower due to buoyant
force in water
Daya apungan ialah daya ke atas
yang bertindak apabila objek
direndam dalam bendalir
sepenuhnya atau sebahagian.
The buoyant force is an upward
force resulting from an object
being wholly or partially immersed
in a fluid.
Meningkat / Increases
sesarkan
displaced
500
700
200
200
Isipadu air disesarkan = isipadu
objek dalam air
Volume of water displaced =
volume of object immersed in
water
• Isipadu air disesarkan = isipadu objek dalam air
• The volume of the immersed part on an object in
a liquid is EQUAL to the volume of the displaced
liquid.
It is very much easier to lift object when it is beneath the water
surface. Why?
Observe the shape of the fishing rod as the ship comes out of the water.
25 N
15 N
10 N
100 N
increase
lower
Permukaan bawah > dalam / bottom face is deeper
P2 > P1 sebab P2 lebih dalam /
P2 is deeper
F1 = P1A
F2 = P2A
F2 > F1
F = F2 - F1
Ke atas / upward
Daya apungan / buoyant force
Weight of the liquid displaced
Water
Displaced
Measure
Measure
Weight , W1
Weight of the object in the
air, W1 /N 2.2
Weight of the object in
water, W2 /N 2.0
Weight of the empty
beaker, W3 /N 0.11
Weight of the beaker and
water, W4 /N 1.31
Loss in weight of the
object , W1 –W2 /N 0.20
Weight of water displaced,
W4 –W3 /N 0.20
Sama / equal
Sama / equal
Sama / equal
Daya apungan = berat air disesarkan
buoyant force = weight water
displaced
Remember !!!
Archimedes Principle
Buoyant Force
= Weight of water displaced.
Archimedes Principle
• Apabila objek direndam di dalam air sepenuhnya
atau separuh, daya apungan sama dengan berat air
yang disesarkan. “ When an object is immersed in a
fluid,the buoyant force is equal to the weight of
fluid displaced by the object.
8 N 6 N
1 N
3 N
Lost in weight = bouyant force = 8 – 6 = 2 N
Weight of displaced water = 2 N = bouyant force
Daya apungan = berat air disesarkan
buoyant force = weight water displaced
FB = Wberat air disesarkan = Wwater displaced
FB = Wberat air disesarkan = Wwater displaced
= mg m = jisim air disesarkan
mass of water displaced
Daya apungan = ρVg
buoyant force = ρVg
Daya apungan = Wudara – Wair
buoyant force =
65 – 30 = 35 N
35 N
Fb = ƿVg
1000 V 10 = 35
V = 3.5 x 10 -3 m3
Isipadu objek dlm air = isipadu air sesar
Volume of object immersed in water
= volume of water displaced
= 3.5 x 10 -3 m3
Buoyant force, B = ρVg = Berat di udara – berat dalam air
2.5 – 2.2 = ρ x 25 x 10-6 x 10
ρ = 1200 kg m-3
W
Buoyant
force, FB
W = FB
0.2 kg
2.0 N
0.13
0.33
0.20
2.0 N
W epal = W air disesarkan
Weight of water displaced = Buoyant force
= weight of the boy + weight of the float
Weight of
iceberg =
Buoyant force
= Weight of sea
water displaced
Buoyant force = weight of object = 900 N
Daya apungan = berat objek = 900 N
Buoyant force = weight of water displaced = 900 N
Daya apungan = berat air disesarkan = 900 N
V = Ah = 0.08 x 4 x 10-4
= 3.2 x 10-5 m3
W = ρVg = 1000 x 0.000032 x 10
= 0.32 N
Daya apungan = 0.32 N
Daya apungan = berat tiub + berat plumbum
0.32 = (0.012 x 10) + Wpb
W = 0.32 – 0.12 = 0.20 N
Mass / jisim plumbum = 0.2/10 = 0.02 kg = 20 g
Buoyant force = weight of object
Daya apungan = berat objek
= 100 x 10 = 1000 N
Weight of fish in water is lighter
Berat ikan dalam air lebih ringan
Buoyant force only acts on the fish in
water.
Daya apungan hanya bertindak ke
atas ikan dalam air.
Berat kapal = Berat air laut disesarkan
Weight of ship = Weight of sea water displaced
Keluli lebih tumpat dari air. Sebongkah
keluli akan sesarkan sedikit isipadu air
sahaja
Steel is denser than water. A block of
steel will displaced a small volume of
water only
Daya apungan keluli kecil daripada berat
keluli. Oleh itu sebongkah keluli
tenggelam.
So the buoyant force acting on it is less
than its weight. Therefore it sinks.
Kapal keluli terapung atas air kerana ia
sesarkan isipadu air yang banyak.
A ship floats on the surface of the sea
because the volume of water displaced
by the ship is sufficiently large.
Berat air disesarkan sangat besar,
jadi daya apungan ke atas kapal
sangat besar.
The weight of water displaced is
large so the buoyant force acting on
the ship is large.
Berat kapal = berat air disesarkan
weight ship = weight of water
displaced.
Berat kapal = Berat air laut disesarkan
Weight of ship = Weight of sea water displaced
Aras bot dalam air laut lebih tinggi /
bot lebih tenggelam dalam air sungai
The level of the boat in the sea is higher
/ the bot sink deeper in the river.
Ketumpatan air sungai rendah
The river water is less dense
Isipadu air sungai disesarkan lebih
banyak.
The volumes of river water displaced is
greater.
Daya apungan adalah sama kerana bot
yang sama
Semakin kurang ketumpatan air, semakin
banyak air yang disesarkan.
Oleh itu bot tenggelam lebih dalam
sungai.
Buoyant force are equal because the
same bot.
the less dense the water, the greater
the water is displaced.
Therefore the bot submerged deeper in
the river.
Bot menyesarkan lebih banyak air bagi
mendapatkan daya apungan lebih
besar untuk menyokong berat
tambahan
The bot displaced more water to get
greater buoyant force in order to
support the extra weight.
Membantu menentukan aras selamat
bagi sebuah kapal untuk terapung
Help to determine the safe level for a
ship to float.
Terdapat perbezaan suhu air laut
berbeza. Oleh itu ketumpatan air laut
berbeza dengan lokasi.
The temperature of sea water different
so the density of sea water varies with
the location.
Ketumpatan air sungai lebih rendah, ia
tenggelam lebih dalam.
The density of river water is lower, so it
sinks deeper.
Pada musim sejuk, ketumpatan air laut
tinggi, bahagian kapal yang tenggelam
kurang. (sesarkan sedikit air)
During winter, the density of sea water
is higher (cold), so the ship sink lower
in water.
Mengawal kedudukan dan kedalaman
kapal selam dalam air dengan
mengawal kuantiti air diisi.
Control the position and depth of
submarine in water by controlling the
quantity of water filled.
Apabila air diisi dalam tangka ballast,
berat kapal selam bertambah, ia
tenggelam.
Apabila air dikeluarkan, daya apungan
lebih besar dari berat, ia naik ke atas
When filled with water, weight is
bigger, so the submarine sink.
When water is removed, buoyant force
is bigger than the weight, it rises up.
Mengukur ketumpatan cecair
Measure the density of liquid
Hidrometer terapung tegak
Hidrometer floats vertically upward.
Daya apungan yang besar
Greater buoyant force
Dapat mengesan perubahan kecil / lebih peka
Can detect small change / more sensitif
Daya apungan sama kerana berat
hydrometer yang sama. Berat objek
sama dengan daya apungan bila objek
terapung.
Sama buoyant force because weight of
hydrometer is same. Weight of object =
buoyant force when object floats.
Hydrometer akan sesarkan banyak air,
jadi lebih tenggelam.
Hydrometer will displaced more water,
so it sinks deeper.
Cecair A lebih tumpat
Liquid A is denser
Berat dan daya apungan
Weight and buoyant force
Ketumpatan udara di dalam belon kurang tumpat
The density of air in the balloon is lower
Panaskan udara di dalam,
besarkan saiz belon
Heat the air in the balloon
Increases the size of the balloon
Untuk menambahkan isipadu udara
yang disesarkan, oleh itu daya apungan
bertambah. F = ρVg
To increases the volume of air displaced,
so the buoyant force is greater
Sama / equal
Belon naik ke atas
The balloon rises up
Belon terapung pegun di udara.
The balloon floats stationary in the air.
FB = 1.3 x 2080 x 10 = (1900 x 10) + WTambahan
W = 8 040 N

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3.5 archimedes 2018

  • 1.
  • 2.
  • 3.
  • 4.
  • 5. Rasa satu daya ke atas / Feel an upward force Bertambah / Increases Bertambah / Increases
  • 6. Semakin bertambah daya apungan semakin banyak isipadu air disesarkan The higher the buoyant force the larger the volume of water displaced Memecut / accelerates
  • 7. W1 > W2 Berat objek dalam air lebih rendah disebabkan daya apungan dalam air. / Weight of object in water is lower due to buoyant force in water
  • 8. Daya apungan ialah daya ke atas yang bertindak apabila objek direndam dalam bendalir sepenuhnya atau sebahagian. The buoyant force is an upward force resulting from an object being wholly or partially immersed in a fluid.
  • 9. Meningkat / Increases sesarkan displaced 500 700 200 200 Isipadu air disesarkan = isipadu objek dalam air Volume of water displaced = volume of object immersed in water
  • 10. • Isipadu air disesarkan = isipadu objek dalam air • The volume of the immersed part on an object in a liquid is EQUAL to the volume of the displaced liquid.
  • 11. It is very much easier to lift object when it is beneath the water surface. Why?
  • 12. Observe the shape of the fishing rod as the ship comes out of the water.
  • 13.
  • 14. 25 N 15 N 10 N 100 N
  • 15. increase lower Permukaan bawah > dalam / bottom face is deeper P2 > P1 sebab P2 lebih dalam / P2 is deeper F1 = P1A F2 = P2A
  • 16. F2 > F1 F = F2 - F1 Ke atas / upward Daya apungan / buoyant force
  • 17. Weight of the liquid displaced Water Displaced
  • 18.
  • 20. Weight of the object in the air, W1 /N 2.2 Weight of the object in water, W2 /N 2.0 Weight of the empty beaker, W3 /N 0.11 Weight of the beaker and water, W4 /N 1.31 Loss in weight of the object , W1 –W2 /N 0.20 Weight of water displaced, W4 –W3 /N 0.20
  • 21. Sama / equal Sama / equal Sama / equal Daya apungan = berat air disesarkan buoyant force = weight water displaced
  • 22. Remember !!! Archimedes Principle Buoyant Force = Weight of water displaced.
  • 23. Archimedes Principle • Apabila objek direndam di dalam air sepenuhnya atau separuh, daya apungan sama dengan berat air yang disesarkan. “ When an object is immersed in a fluid,the buoyant force is equal to the weight of fluid displaced by the object.
  • 24. 8 N 6 N 1 N 3 N Lost in weight = bouyant force = 8 – 6 = 2 N Weight of displaced water = 2 N = bouyant force
  • 25. Daya apungan = berat air disesarkan buoyant force = weight water displaced FB = Wberat air disesarkan = Wwater displaced FB = Wberat air disesarkan = Wwater displaced = mg m = jisim air disesarkan mass of water displaced
  • 26. Daya apungan = ρVg buoyant force = ρVg Daya apungan = Wudara – Wair buoyant force =
  • 27. 65 – 30 = 35 N 35 N Fb = ƿVg 1000 V 10 = 35 V = 3.5 x 10 -3 m3 Isipadu objek dlm air = isipadu air sesar Volume of object immersed in water = volume of water displaced = 3.5 x 10 -3 m3
  • 28. Buoyant force, B = ρVg = Berat di udara – berat dalam air 2.5 – 2.2 = ρ x 25 x 10-6 x 10 ρ = 1200 kg m-3
  • 30. 0.2 kg 2.0 N 0.13 0.33 0.20 2.0 N W epal = W air disesarkan
  • 31.
  • 32. Weight of water displaced = Buoyant force = weight of the boy + weight of the float Weight of iceberg = Buoyant force = Weight of sea water displaced
  • 33. Buoyant force = weight of object = 900 N Daya apungan = berat objek = 900 N Buoyant force = weight of water displaced = 900 N Daya apungan = berat air disesarkan = 900 N
  • 34. V = Ah = 0.08 x 4 x 10-4 = 3.2 x 10-5 m3 W = ρVg = 1000 x 0.000032 x 10 = 0.32 N Daya apungan = 0.32 N Daya apungan = berat tiub + berat plumbum 0.32 = (0.012 x 10) + Wpb W = 0.32 – 0.12 = 0.20 N Mass / jisim plumbum = 0.2/10 = 0.02 kg = 20 g
  • 35. Buoyant force = weight of object Daya apungan = berat objek = 100 x 10 = 1000 N
  • 36. Weight of fish in water is lighter Berat ikan dalam air lebih ringan Buoyant force only acts on the fish in water. Daya apungan hanya bertindak ke atas ikan dalam air.
  • 37. Berat kapal = Berat air laut disesarkan Weight of ship = Weight of sea water displaced
  • 38. Keluli lebih tumpat dari air. Sebongkah keluli akan sesarkan sedikit isipadu air sahaja Steel is denser than water. A block of steel will displaced a small volume of water only Daya apungan keluli kecil daripada berat keluli. Oleh itu sebongkah keluli tenggelam. So the buoyant force acting on it is less than its weight. Therefore it sinks.
  • 39. Kapal keluli terapung atas air kerana ia sesarkan isipadu air yang banyak. A ship floats on the surface of the sea because the volume of water displaced by the ship is sufficiently large. Berat air disesarkan sangat besar, jadi daya apungan ke atas kapal sangat besar. The weight of water displaced is large so the buoyant force acting on the ship is large. Berat kapal = berat air disesarkan weight ship = weight of water displaced.
  • 40. Berat kapal = Berat air laut disesarkan Weight of ship = Weight of sea water displaced
  • 41. Aras bot dalam air laut lebih tinggi / bot lebih tenggelam dalam air sungai The level of the boat in the sea is higher / the bot sink deeper in the river. Ketumpatan air sungai rendah The river water is less dense Isipadu air sungai disesarkan lebih banyak. The volumes of river water displaced is greater.
  • 42. Daya apungan adalah sama kerana bot yang sama Semakin kurang ketumpatan air, semakin banyak air yang disesarkan. Oleh itu bot tenggelam lebih dalam sungai. Buoyant force are equal because the same bot. the less dense the water, the greater the water is displaced. Therefore the bot submerged deeper in the river.
  • 43. Bot menyesarkan lebih banyak air bagi mendapatkan daya apungan lebih besar untuk menyokong berat tambahan The bot displaced more water to get greater buoyant force in order to support the extra weight.
  • 44. Membantu menentukan aras selamat bagi sebuah kapal untuk terapung Help to determine the safe level for a ship to float. Terdapat perbezaan suhu air laut berbeza. Oleh itu ketumpatan air laut berbeza dengan lokasi. The temperature of sea water different so the density of sea water varies with the location.
  • 45. Ketumpatan air sungai lebih rendah, ia tenggelam lebih dalam. The density of river water is lower, so it sinks deeper. Pada musim sejuk, ketumpatan air laut tinggi, bahagian kapal yang tenggelam kurang. (sesarkan sedikit air) During winter, the density of sea water is higher (cold), so the ship sink lower in water.
  • 46. Mengawal kedudukan dan kedalaman kapal selam dalam air dengan mengawal kuantiti air diisi. Control the position and depth of submarine in water by controlling the quantity of water filled. Apabila air diisi dalam tangka ballast, berat kapal selam bertambah, ia tenggelam. Apabila air dikeluarkan, daya apungan lebih besar dari berat, ia naik ke atas When filled with water, weight is bigger, so the submarine sink. When water is removed, buoyant force is bigger than the weight, it rises up.
  • 47. Mengukur ketumpatan cecair Measure the density of liquid Hidrometer terapung tegak Hidrometer floats vertically upward. Daya apungan yang besar Greater buoyant force Dapat mengesan perubahan kecil / lebih peka Can detect small change / more sensitif
  • 48. Daya apungan sama kerana berat hydrometer yang sama. Berat objek sama dengan daya apungan bila objek terapung. Sama buoyant force because weight of hydrometer is same. Weight of object = buoyant force when object floats. Hydrometer akan sesarkan banyak air, jadi lebih tenggelam. Hydrometer will displaced more water, so it sinks deeper. Cecair A lebih tumpat Liquid A is denser
  • 49. Berat dan daya apungan Weight and buoyant force Ketumpatan udara di dalam belon kurang tumpat The density of air in the balloon is lower Panaskan udara di dalam, besarkan saiz belon Heat the air in the balloon Increases the size of the balloon
  • 50. Untuk menambahkan isipadu udara yang disesarkan, oleh itu daya apungan bertambah. F = ρVg To increases the volume of air displaced, so the buoyant force is greater Sama / equal
  • 51. Belon naik ke atas The balloon rises up Belon terapung pegun di udara. The balloon floats stationary in the air.
  • 52. FB = 1.3 x 2080 x 10 = (1900 x 10) + WTambahan W = 8 040 N