Forces n Pressure

7/30/2019 Forces n Pressure

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FORCES AND PRESSURE

What is the relationship between pressure and area if the force applied is kept constant?

A Pressure directly propotional to area

B Pressure directly propotional to 1 / area

C P inversely propotional to 1 / A

Diagram 6 shows a storage oil tank.

Diagram 6

Which is the correct comparison of pressure and depth at X and Y?

X Y

A Low depth, low pressure. High depth, high pressure.

B Low depth, high pressure. High depth, low pressure.

C High depth, low pressure. Low depth, high pressure.

D High depth, high pressure. Low depth, low pressure.

Diagram 7 shows a manometer used to measure pressure in gas cylinder. Which of the

following statement is correct about the pressure in the cylinder?

Diagram 7

A Pressure inside the gas cylinder is lower than the atmospheric pressure.

B Pressure inside the gas cylinder is equal than the atmospheric pressure.

C Pressure inside the gas cylinder is higher than the atmospheric pressure.


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Diagram 8 shows the actual weight of a stone is 3 N. The apparent weight of the object when it

is immersed in water is 1.7 N.

What is the density of the object?

A 20 g cm-3

B 35 g cm-3

C 1.3 g cm-3

D 1.7 g cm-3

Diagram 9 shows an insecticide sprayer.

Diagram 9

Which of the region experiences low pressure, when the piston is pushed into the cylinder?

A X

B Y

C

Z

11. Diagram 8 shows two identical bricks X and Y placed in two different ways on a sandy

ground were pressed by an identical force, F.

Diagram 8


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What is the factor that causes brick Y to sink more into the sand?

A Force, F

B Weight of the block

C Pressure, P

D Density of the block

12. Diagram 9 shows a hydraulic system which is in equilibrium. When the piston A is pushed

in, the piston B will be lifted up

Which of the following statements is true?A The pressure on the piston A is smaller than the pressure on the piston B.

B The pressure on the piston A is bigger than the pressure on the piston B.

C The pressure on the piston A is equal to the pressure on the piston B.

13. Diagram 10 shows the arrangement of an apparatus for an experiment.

Which of the following conclusions is correct ?

A Liquid pressure acts perpendicularly to its surface.

B Liquid pressure increases with depth.

C Liquid pressure does not depend on the shape of the container.

D Liquid pressure is caused by its weight acting on a surface.

14. Diagram 11 shows a simple mercury barometer. Which of the height A, B, C or D shows

the measurement of the atmospheric pressure?

Diagram 8

Diagram 9

liquid

Diagram 10

Rajah 10


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15. Diagram 12 shows a suction pump is pressed on a smooth surface. P and Q are the

pressure acted towards the outer surface and the inner surface of the suction pump

respectively.

The pump is stuck to the smooth surface due to

A P < QB P > Q

C P = Q

D Q = 0

16. Diagram 13 shows a baseball which is thrown forward with a spinning, is moving in a curve.

This situation can be explained by using

A Archimedes principle

B Bernoullis principle

Diagram 11

Rajah 11

smooth surface

suction pump

QP

Diagram 12

Rajah 12

Diagram 13

Rajah 13

fast airflow

slow airflow

deviated path

mercury

merkuri

A

B

CD


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C Pascals principle

17. Which of the following pressure,P in liquid against depth,h, graphs is correct?

A

B

C

D

18. Diagram 14 shows a spring balance supporting a metal block is immersed slowly into a

beaker, A which filled with water. The compression balance shows the reading of the weight, W

of a beaker, B filled with water.

Which of the following W against x graphs is correct?

A

P

h0

P

h0P

h0P

h0

Diagram 14

W

x0


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B

C

D

12 Diagram 6 shows four different postures of a person doing some exercises.

Which posture exerts the maximum pressure on the floor?

Diagram 6

13 Diagram 7 shows three containers filled with water to the same level. The pressure caused

by the water at points X, Y and Z are PX, PY and PZ respectively.

Diagram 7

Which comparison is correct?

A PX = PY = PZ

B PX < PY < PZ

C PX > PY > PZ

14 Diagram 8 shows a mercury barometer. Which height shows the measurement of the

atmospheric pressure?

W

x0W

x0

W

x0

BVacuum


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Diagram 8

15 Diagram 9 shows the random motion of the gas molecules inside a container.

Diagram 9

The pressure of the gas will not increase if

A the number of molecules in the container is increased

B the mass of the molecules is increased

C the speed of the molecules is increased

D the volume of the container is increased

16 Diagram 10 shows a hydraulic compressing machine.

Diagram 10

Which comparison is true about the forces F1 and F2?

A F1 = F2

B F1 > F2

C F1 < F2

17 Diagram 11 shows an oil drum of volume V floating with4

3of its volume submerged

under water.

Diagram 11

If the density of water is , the buoyant force acting on the oil drum is

A gV4

1

B gV4

3

C Vg

D V


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18 Which diagram shows the correct liquid level in the U-tube?

12 Which of the following is a benefit of high pressure?

A A tractor has broad tyres.

B A hard object can be cut using the sharp edge of a knife.

C A military tanks having special wheels called caterpillar tracks.

D An elephant has big feet that contact on the ground.

13 Diagram 7 shows two identical containers containing liquid R and liquid S.

The horizontal distance of the spurts for both liquids is the same.

Diagram 7

Which of the following is the correct comparison between the density of liquid R and

liquid S?

A Density of liquid R = density of liquid S

B Density of liquid R > density of liquid S

C Density of liquid R < density of liquid S

14 Diagram 8 shows an inverted glass that filled with water covered by a piece of light cardboard.

Diagram 8

The water in the glass does not flowing out. This phenomenon occurs due to

A the surface area of the cardboard in contact with glass is big.

B the weight of the cardboard is greater than the weight of the water.

C the density of the water is higher than the density of the cardboard.

D the resultant force F acting on the cardboard is greater the weight of the water.


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15 Diagram 9 shows a manometer connected to a gas supply.

Diagram 9

The pressure given by the gas supply is 96 cm Hg.

What is the value of h?

[Atmospheric pressure = 76 cmHg]

A 20 cm B 76 cm C 96 cm D 176 cm

16 Diagram 10 shows a hydraulic system.

Diagram 10

Which of the following statements is true?

A The physics concepts involved is Bernoullis Principle.

B Piston Y has higher pressure than piston X.

C The force exerted on piston X is equal to the force exerted on piston Y.

D The force on piston Y is 200 N if the surface area of piston Y is two times

bigger than surface area of piston X.

17 Which of the following works using Archimedes Principle?

18 Diagram 11 shows the water flows through a Bernoullis tube from point P to R.

In which vertical tube, A, B, C or D, the water level is the lowest?


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Diagram 11

13

The following diagrams show four different nails hit by a hammer with the same amount of

force.which nail causes the most pressure on the wood?

14

The following diagrams show four identical measuring cylinders. Four different liquids are poured

into the four different cylinders. The diagrams also show the depths of the liquids and their

densities. Which liquid causes the largest pressure on the base of its measuring cylinder?

15

Diagram 9a shows the weight of a load in air .Diagram 9b shows the same weight immersed in

water.

What is the buoyant force when the load is fully immersed in water?

A 2 N C 8 N

B 6 N D 10 N

16 The following diagrams show a simple mercury barometer.

Which diagram shows the distance to be measured to find atmospheric pressure?


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12 Diagram 6 shows two identical bricks X and Y placed with two different ways on a

sandy ground.

Diagram 6

What is the factor that causes brick Yto sink more into the sand?

A Weight

B Pressure

C Force

D Density

13 Figure 7 shows a school bag.

Diagram 7

What is the function ofX?

A To increase weight and to increase pressure

B To increase surface area and to decrease pressure

C To decrease weight and to decrease pressure

D To decrease surface area and to increase weight

14 Diagram 8.1 and diagram 8.2 show a fisherman when he is at sea and in the river.

Diagram 8.1 Diagram 8.2


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Which of the following is TRUE?

A The buoyant force acting on Diagram 8.1 is more than in Diagram 8.2.

B The water level of boat Diagram 8.1 equal to that in Diagram 8.2

C The physics principle that explains the above situation is Pascals Principle

D The volume of water displaced by the boat in Diagram 8.1 is less than in Diagram

8.2.

15 Diagram 9 shows a cylinder containing water.

Diagram 9

If the height of h is 0.8 m, Calculate the pressure at point P?

[the density of the water = 1000 kg m-3

]

A 10 000 N m-2

B 12 000 N m-2

C 11 500 N m-2

D 12 500 N m-2

16 Diagram 10 shows a application of Pascals Principle.

Diagram 10

Which of the following equation shows the right relationship between F1, F2,A1 and

A2?

A

B F1(A1) = F2 (A2)

C


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D

17 Diagram 11 shows a card and a glass of water.

Diagram 11

When the hand is released, water does not flow out from the glass. What is physic

concept involved in the above situation?A Liquid pressure

B Atmospheric pressure

C Gas pressure

D Boyle Laws

12 Gas pressure in a closed container is due to the gas molecules

A moving randomly

B moving with equal speed

C colliding with one another

D colliding with the walls of the container

13 Diagram 8 shows liquid X and liquid Y in glass tubes.

Diagram 8

Which statement is correct?

A PS = PT because S and T are at the same depthB PS = PT because S and T are at the same level

C PS < PT because the density of X is less than the density of Y

D PS > PT because S is nearer to the bottom of the tube


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14 Diagram 9 shows a manometer used to measure the pressure of the gas in the container.

Diagram 9

Which statement is true about the pressure of the gas in the container if the atmospheric

pressure is 76.0 cm Hg?

A The gas pressure is zero

B The gas pressure is equal to the atmospheric pressure

C The gas pressure is 24.0 cm Hg more than atmospheric pressure

D The gas pressure is 24.0 cm Hg less than atmospheric pressure

15 Diagram 10 shows a crane lifting a concrete beam.

Diagram 10

What principle is used to move the piston at the arm of the crane?A Pascal's principle

B Archimedes' principle

C Bernoulli's principle

17 Diagram 11 shows the cross-section of an iceberg floating on the surface of the sea.


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A. ManometerB. SiphonC. CarburetorD. Hydrometer

13.

Diagram 7 shows an aerofoil.

Which part of the aerofoil below has the lowest pressure?

A P

B Q

C R

D S

14. Car brake system works based on

A. Bernoullis principleB. Pascals principleC. Archimedes principleD. Boyles law

15. Which of the following principles explains a floating object in a fluid?

A. Bernoullis principle

B. Pascals principle

C. Archimedes principleD. Boyles law

16. What is the pressure of water at a depth of 20m?

[Density of water = 1000 kg m-3

]

A. 200 000 Pa

B. 2000 Pa

C. 500 Pa

D. 5 Pa

17. Diagram 8 shows a ball immersed in a basin of water.

Diagram 8

If the volume of the ball is 0.2 m3, what is the buoyant force acting on the ball?

[Density of the water is 1000 kg m-3

]

P

SR

Q

Diagram 7

Rajah 7


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A. 2 N

B. 20 N

C. 200 N

D. 2000 N

18. Diagram 9.1 shows a mercury manometer in an open air. Diagram 9.2 shows reading

of the mercury manometer when the manometer connected to a gas supply.

Calculate the pressure of the gas if the atmospheric pressure is 1.03x105 Pa.

( Density of mercury is 1.36 x 10 4 kg m -3 , and g =10 N kg -1 )

A. 1.03x105 Pa

B. 1.11x105 PaC. 7.13 x10

5Pa

D. 8.16 x105

Pa

19. The pressure produced by a gas in a container is due to

A the elastic collisions between the gas particles.

B the strong force of attraction between the gas particles.

C the forces of attraction and repulsion between the gas particles as well as

the walls of the container.

D the impulsive force produced during the collisions between the gas

particles and the walls of the container.

15 Diagram 9.1 and Diagram 9.2 shows a mercury barometer and mercury manometer respectively.

The manometer is connected to a gas supply.

DIAGRAM 9.1 DIAGRAM 9.2

Diagram 9.1 Diagram 9.2


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What is the pressure of the gas from the gas supply?

A 29 cm Hg

B 46 cm Hg

C 52 cm Hg

D 75 cm Hg

E 104 cm Hg

16 A mixture of gas and air is produced by a bunsen burner. This can be explained byA Archimedes principle


C Pascals principle

D the principle of conservation of momentum

17 Diagram 10 shows a hydraulic device. The force, F, is able to support a load of weight, W.

DIAGRAM 10

What is the relationship between W, F, A and a?

A WA = Fa

BaF

AW

CA

F

a

W

D W +A = F+ a

18 Diagram 11.1 and Diagram 11.2 shows an object being weighed in air and in water respectively.


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Which of the following statement is true.

A. There is no forces acting on the ping pong ball.

B. The water flows arround the ping pong ball creates a region of high pressure.

C. There is a net upward force holds up the ping pong ball.

13. Which of the following appliances work based on Bernoullis Principle ?

A Bunsen burner, syringe and car carburator.B. Bunsen burner, filter pump and car carburator.

C. Wing of aeroplane, syringe and filter pump.

D. Wing of aeroplane, filter pump and syringe.

12 The diagram shows a simple mercury barometer.

Which of the following does not cause the height of the mercury column to vary?

A. Changes in atmospheric pressure.

B Changes in the temperature of mercury.

D Changes in the value of gravitational acceleration, g.D Evaporation of mercury from the barometer reservoir.

13 The diagram below shows a siphon in operation

Which of the following statement is true?

A Water flows from the conical flask until the flask is empty.

B Water flows from the beaker to the conical flasks until the flask is full.

C Water flows from the beaker to the conical flask until the water levels in both containers are

equal.

D Water flows from the beaker to the conical flask until the volume of water in both containers

are equal.

14 The areas of the pistons P and Q in the diagram below are A1= 0.060 m2 and A2 = 0.03m

2.


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If you press down piston P with a force of 5.0 N, how much upward force will result at piston Q?

A 30.0 N

B 10.0 N

C 3.0 N

D 2.5 N

F1

(downwards)

F2

(upwards)

Piston Area, A1 Piston Area,

A2

Surface

levels are

Incompressible liquid

QP


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14 Luas P dan Q dalam rajah di bawah adalah A1= 0.060 m2

and A2 = 0.03m2

masing-masing.

Jika piston P ditekan dengan daya 5.0 N, berapakah daya ke atas yang terhasil pada piston Q?

A 30.0 N

B 10.0 N

C 3.0 N

D 2.5 N

Daya F1

(ke bawah)

Daya F2

(ke atas)

Luas Omboh P,A1

Luas Omboh

Q, A2

Araspermukaan

Cecair tidak termampat


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16 A container with dimension 3 m x 1 m x 0.5m is filled with oil which weighs 12000 N.

What is the minimum pressure exerted by the container due to the oil?

A 3 000 Pa

B 4 000 Pa

C 6 000 Pa

D 8 000 Pa

17 There are many uses of atmospheric pressure in everyday life. Which of the following operates on the

effect of the atmospheric pressure?

A Lift pump

B Carburetors

C Bunsen burner

D Hydraulic brakes

0.5 m

3.0 m

1.0 m


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16 Sebuah bekas dengan dimensi 3 m x 1 m x 0.5m diisi dengan minyak yang mempunyai berat 12000

N.

Berapakah tekanan minimum yang dikenakan oleh bekas dan minyak itu?

A 3 000 Pa

B 4 000 Pa

C 6 000 Pa

D 8 000 Pa

17 Terdapat banyak kegunaan tekanan atmosfera dalam kehidupan seharian. Antara yang berikut yang

manakah beroperasi menggunakan prinsip tekanan atmosfera?

A Pam pengangkat

B Karburetor.

C Penunu Bunsen.

D Brek hidraulik

0.5 m

3.0 m

1.0 m


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18 The diagram shows a block of wood with a mass of 300 g is partially immersed in a liquid.

Calculate the buoyant force acting on the block of wood?

A 3.0 N

B 2.5 N

C 1.8 N

D 1.5 N

19 The diagram shows an aeroplane in flight.

Rajah menunjukkan sebuah kapal terbang di udara.

For the aeroplane to climb into air and stay up during flight,

Untuk kekal dalam penerbangan ,

A Drag > ThrustTujah ke belakang > tujah ke hadapan

B Thrust > Drag

Tujah ke hadapan > tujah ke belakang

C Lift > Weight

Daya angkat > Berat

D Weight > Lift

Berat > Daya angkat

20 The diagram shows the Fantastic Submarine drifting along from a narrow

region to a wider region because of

Rajah menunjukkan Kapal selam Fantastic hanyut dari kawasan sempit keyang kurang sempit kerana


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A Equilibrium of forces

Keseimbangan daya


Prinsip Bernoulli

C Archimedes principle

Prinsip Archimedes

D conservation of momentum

Prinsip keabadian momentum

[ Lihat sebelah

21 Air is blown between two ping pong balls.

Udara ditiup di antara dua bola ping pong.

udara

Which statement is correct?

Pernyataan yang mana benar?

A An area area of higher pressure is created between the ping pong balls

Kawasan tekanan tinggi terhasil di antara bola bola itu

B The ping pong balls will be be blown apart

Bola bola itu akan terpisah jauh

C The ping pong balls will move closer to each other

Bola bola akan merapat

22 The diagrams show the relationship between Pressure and

Volume of air.

Rajah rajah menunjukkan perhubungan antara Tekanan dan Isipadu udara

Which statement is true ?

Pernyataan yang mana benar ?

A More collisions occur between the air molecules and the wall of the container mmm

Container www

Container mmm

Bekas mmm


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Perlanggaran di antara zarah zarah udara dengan dinding bekas www

lebih kerap

B Less collisions occur between the air molecules and the wall of the container mmm

Perlanggaran di antara zarah zarah udara dengan dinding bekas mmm

berkurangan

C The volume of air does not affect the pressure

Tekanan tidak dipengaruhi oleh isipadu udara

23 The diagram shows a hyraulic pump.Rajah menunjukkan sebuah pam hidraulik.

Which comparison is true?

Perbandingan yang manakah benar?

A F1 = F2

B F1 > F2

C Pressure on piston 1 = pressure on piston 2

Tekanan di omboh 1 = tekanan di omboh 2

D Pressure on piston 1 < pressure on piston 2

Tekanan di omboh 1 < tekanan di omboh 2

24 The diagram shows a water reservoir .

Rajah menunjukkan sebuah empangan.

Hillslope water wall of dam

Lereng bukit Air dinding

empangan

The base of the wall is thicker because

Bahagian bawah dinding lebih tebal kerana

A it will be more stable.

dinding akan lebih stabil

B the density of water is high

ketumpatan air tinggi

C Pressure of the water is highest at the surface

Tekanan paling tinggi di bahagian permukaan air

D Pressure of the water is highest at the base


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13 The diagram shows water spurting out from a hole of a container at a distance ofa.

When the level of the water decreases, what will happen to the distance, a ?

A Increases

B DecreasesC Remains constant

14 The diagram shows a submarine which is partially submerged in water.

Gambar rajah menunjukkan sebuah kapal selam yang terendam sebahagiannya di dalam air.

Which relationship between the physical quantities in the above situation is correct?

A Weight of water displaced < weight of the submarine + weight of water in the ballast tank.

B Weight of water displaced = weight of the submarine + weight of water in the ballast tank.

C Weight of water displaced > Weight of the submarine + Weight of water in the ballast tank.

Submarine


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15 The diagram shows a stream of air flowing through a tube with a narrow neck.

Which of the following graphs describes the relationship between the air pressure, P and the distance, x?

A B

C D

12 Which of the following operates on the effects of atmospheric pressure?Yang manakah beroperasi berdasarkan kesan tekanan atmosfera?

A Lift pump / Pam AngkatB Hydraulic brakes / Brek hidraulikC Aerofoil / aerofoil

13 What is the pressure acting on a diver when he is 10 m underwater ?[ Density of water = 10

3kg m

-3, gravitational field strength = 9.8 N kg

-1, atmospheric

pressure = 1 x 105

Pa ]

Berapakah tekanan yang bertindak ke atas seorang penyelam yang berada 10 m di

dalam air?

A 10 5 PaB 2 x 10 5 PaC 3 x 10 5 PaD

4 x 10

5

PaE 5 x 10 5 Pa

jarak, x

aliran udara


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14 The diagram shows the position of a hydrometer in four different liquids P, Q, R and S.Which liquid has the lowest density ?

Gambar rajah menunjukkan kedudukan hidrometer di dalam empat jenis cecair yang

berbeza P, Q, R dan S. Cecair manakah yang mempunyai ketumpatan paling rendah ?

15 The presence of air bubbles in the hydraulic brake system causes the system to functioninefficiently. Which statement explains this observation ?

Kehadiran gelembung-gelembung udara di dalam sistem brek hidraulik akan

menyebabkan sistem tidak cekap. Pernyataan manakah menerangkan pemerhatian ini ?

A The air bubbles reduce the viscosity of the brake fluidGelembung-gelembung udara mengurangkan kelikatan cecair brek

B The air bubbles escape when the brake pedal is pressedGelembung-gelembung udara terbebas keluar apabila brek ditekan

C The air bubbles expand when the brake system becomes hot due to frictionGelembung-gelembung udara mengembang apabila sistem brek menjadi panas

disebabkan oleh geseran

D The air bubbles are compressed when the brake is pressed.Gelembung-gelembung udara dimampatkan apabila brek ditekan

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Forces n Pressure