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Upthrust and Archimedes principle

Total questions: 42

Worksheet time: 29mins

Name
Class
Date
1.
The amount of force pushing on an area is the definition of....
a)
Fluid
b)
Viscosity
c)
Barometer
d)
Pressure
2.
What pressure does a 4000N horse exert on the ground if each foot is 10cm2?
a)
40 N/cm2
b)
100 N/cm2
c)
400 N/cm2
d)
10 N/cm2
3.
Where is pressure the greatest on the dam?
a)
D
b)
C
c)
B
d)
A
4.
Look at the pressure triangle. How do we calculate the area?
a)
f ÷ a
b)
f x p
c)
p x f
d)
f ÷ p
5.
True or false:
Pressure depends on depth
a)
true
b)
false
6.

Pressure can be measured in Pascals (Pa) or Newtons per square meter.

1 Pa = 1N/m2

a)

True

b)

False

7.
A person wearing steel toe capped boots and a person wearing stilleto heels stand on a wooden floor. They both have the same weight. Which person exerts a greater pressure on the floor?
a)
The person wearing the boots because the boots have a larger surface area in contact with the floor
b)
The person with the stiletto heels because they have a larger surface area in contact with the floor
c)
The person wearing the boots because the boots have a smaller surface area in contact with the floor 
d)
The person with the stiletto heels because they have a smaller surface area in contact with the floor
8.
How much was the original force multiplied?
a)
  6.4 x
b)
8.3 x
c)
5 x
d)
7 x
9.

As the area a force acts on increases, the force exerted on each unit of area

a)

increases

b)

decreases

c)

remains constant

10.
What direction is the buoyant force in?
a)
Downward
b)
Left
c)
Right
d)
Upward
11.
If the weight of the water displaced is the same as the weight of the object placed in the water, the object will sink.
a)
True
b)
False
12.
When the weight of an object is greater than the buoyant force, the object will ... 
a)
Sink
b)
Float 
c)
Expand
d)
Shrink
13.

You, Archimedes, suspect that the king’s crown is not solid gold but is instead goldplated lead. To test your theory, you weigh the crown, and find it to weigh 60.0 N and to have an apparent weight of 56.2 N when it is completely submerged in water. What is the density of the crown?

a)

15789.5 kg/m3

b)

11300 kg/m3

c)

7500 kg/m3

d)

19300 kg/m3

14.

What scientific rule states that the buoyant force on an object is equal to the weight of the fluid displaced by the object?

a)

Archimedes' principle

b)

Pascal's principle

c)

Bernoulli's principle

d)

Newton's third law of motion

15.
If an object weighing 50.0 N displaces a volume of water with a weight of 10.0 N, what is the buoyant force on the object?
a)
10 N
b)
60 N
c)
40 N 
d)
20 N 
16.
When the weight of an object is greater than the buoyant force, the object will ... 
a)
Sink
b)
Float 
c)
Expand
d)
Shrink
17.

Calculate the hydrostatic pressure acting in the tank shown:

a)

39.24 kPa

b)

26.29 kPa

c)

29.4 kPa

d)

37.82 kPa

18.

Which liquid is the least dense?

a)

oil

b)

water

c)

syrup

d)

plastic bottle

19.

Pressure exerted on the walls of the blood vessels is termed

a)

Hypertension

b)

Vesicular pressure

c)

Blood Pressure

d)

Heart pressure

20.

A cylinder filled with water, if 3 holes are made on the tube side, which one is the right figure

a)
b)
c)
d)
21.

A cuboid has weight of 450 Newton, what is the pressure?

a)

0,9 Pa

b)

9 Pa

c)

90 Pa

d)

900 Pa

22.
If the horse reared up on 2 legs what effect would it have on the pressure?
a)
it will exert half the pressure it did before
b)
it will exert the same pressure it did before
c)
it will exert twice the pressure it did before
d)
it will exert four times the pressure it did before
23.

Look on the figure


What is the pressure that occur on the fish?

a)

8000 N/m²

b)

6000 N/m²

c)

4000 N/m²

d)

2000 N/m²

24.

A ship stays afloat as long as the buoyant force is

a)

less than the ship's weight

b)

equal to the ship's weight

c)

less than the ship's speed

d)

greater than the ship's speed

25.

On what factors does upthrust offered by the liquid depend on?

a)

Density of the liquid

b)

Density of the object

c)

Volume of the liquid displaced

d)

None

26.

What happens if the weight of an object is greater than the upthrust?

a)

it floats

b)

it sinks

c)

it bounces

d)

it vibrates

27.
What is the formula for density?
a)
density = mass x volume
b)
density = mass / volume
c)
density = mass + volume
d)
density = mass - volume
28.
Pressure can be measured in Pascals (Pa) or Newtons per square metre.
1 Pa = 1N/m2
a)
True
b)
False
29.

How do you Calculate Pressure

a)

Force(N)/Area(m2)

b)

Force(kg)/Area(mi2)

c)

Area(m2)/Force(N)

30.

When you increase your depth under water, the water pressure on your body

a)

increases

b)

decreases

c)

stays the same

31.

from the image below which represents the correct force of the fluid pressure on solid objects ...

a)
b)
c)
d)
e)
32.

The up thrust of water acting on a wooden cube of sides 10cm immersed completely in water is

a)

2N

b)

3N

c)

5N

d)

10N

33.

If the weight of an object that is submerged in a fluid is 10 N and the buoyant force on it is 20 N, what will happen to the object?

a)

It will sink

b)

It will float

c)

It will remain in equilibrium

d)

More information is needed

e)

It will sink initially, then float

34.

A boat of mass 810 kg displaces 180 m3 of water when it is lowered into seawater. Calculate the upthrust acting on the hull of the boat and determine whether it will sink or float. Take density of seawater as 1030 kg/m3.

a)

1,818,774 N

b)

1,585,675N

c)

Sink

d)

Float

35.

A boat of mass 210 kg displaces 80 m3 of water when it is lowered into seawater. Calculate the upthrust acting on the hull of the boat and determine whether it will sink or float. Take density of seawater as 1030 kg/m3.

a)

982,544 N

b)

808,344 N

c)

Sink

d)

Float

36.

A cube of brass with dimensions of 500 x 500 x 500 mm and mass of 1,100 kg is lowered into a tank. Determine the upthrust and whether the cube will sink or float if the tank is filled with Crude Oil (Texas).

a)

1.82 kN

b)

1.07 kN

c)

Sink

d)

Float

37.

A cube of brass with dimensions of 500 x 500 x 500 mm and mass of 1,100 kg is lowered into a tank. Determine the upthrust and whether the cube will sink or float if the tank is filled with pure water.

a)

1086.8 N

b)

1226.6 N

c)

Sink

d)

Float

38.

A cube with sides of 80 mm is hung on a weighing scale and weighs 74 N. The cube is lowered into a bucket of pure water until it is fully immersed. What value of weight will the weighing scale show now?

a)

64.72 N

b)

72.33 N

c)

68.98 N

d)

73.20 N

39.

A spherical buoy of diameter 0.5 m and mass 60 kg is attached to the seabed by a mooring rope and floats fully submerged. Calculate the tension in the mooring rope. Take density of seawater as 1020 kg/m3. (Use 2 d.p. throughout calculations)

a)

38.2 N

b)

46.4 N

c)

54.5 N

d)

61.8 N

40.
Objects A-D are in water. Which is the most dense?
a)
A
b)
B
c)
C
d)
D
41.
A helium balloon floats in air because
a)
there is more air than helium.
b)
helium is equally dense as air.
c)
helium is less dense than the air.
d)
helium is as dense as the air.
42.
If two objects are made of the same substance and have the same mass, the shape of the object determines whether or not it sinks or floats in a fluid.
a)
True
b)
False

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