PRESSURE ON LIQUIDS:
Archimedes’ principle
& Buoyancy
Student: __________________________
Group: ___________________________
TABLE OF CONTENTS
Archimedes’ principle………………………………………………………….......
Buoyancy……………………………………………………………………………
Annexes…………………………………………………………………………….
- Glossary
- Summary
Archimedes’ principle
EXERCISE 1:
Match the words around the drawing with its corresponding image.
fluid (water)
body (orange)
displaced fluid
= weight of 150 ml
650 ml
650-500=150 ml
500 ml
upward buoyant force
EXERCISE 2:
Make a drawing for each sentence.
The orange is immersed in the water.
weight
The water level rises.
The displaced water is …………….. ml.
The orange experiences an upward buoyant force.
This upward buoyant force is equal to the weight of the displaced fluid (weight
of ………………… ml of water)
EXERCISE 3:
This is Archimedes’ principle:
When a body is immersed in a fluid, it experiences an
upward buoyant force equal to the weight of the displaced
fluid.
Write the Archimedes’ principle applied to the experiment with the orange. Fill in
the gaps with these words:
water
weight
upward buoyant force
orange
When the ……………. is immersed in the ………….., it
experiences an ……………………… equal to the …………..
of the displaced fluid (…………… ml of water).
= weight of 150 ml
650 ml
500 ml
650-500=150 ml
Buoyancy
EXERCISE 1:
Complete the sentences with the correct word.
sinks
arrive
bottom
floats
The body ………………….
The body ……………………..
The body sinks but it doesn’t ……………….. to the
…………………
EXERCISE 2:
Match the images with the explanation and with the letters (W is weight and Bf
is upward buoyant force):
The body sinks
and falls onto the
bottom.
The body floats.
W = Bf
(equal)
W > Bf
(higher)
The body sinks
but it doesn’t
arrive to the
bottom.
W < Bf
(lower)
EXERCISE 3:
Write the name of these objects under each drawing.
stones
submarine
boat
spoon
wood
coin
…………………….
cork
…………………….
………………….
……………..
………………….
…………………..
…………..
EXERCISE 4:
Match the images on the left column with the examples on the right column.
Then, write a sentence.
…………….
Stones sink.
……………
……………...
……………...
……………...
……………..
EXERCISE 5: (to be done in groups)
Complete the poster that your teacher is going to give you. You have to
-
Write down the Archimedes’ principle.
Complete the drawing about the Archimedes’ principle with suitable
vocabulary.
Cut the flash cards (from a sheet given by your teacher).
Put them in order in the chart.
Check with the members of the group that each image is in its
corresponding place.
Stick them.
Write the sentences that are not given (each square in the table must
have something written).
GLOSSARY
ENGLISH
Boat
Body
Buoyancy
Coin
Cork
Displaced water
Fluid
Immersed
Level
Pressure
Spoon
Stone
Submarine
To float
To rise
To sink
To spill out
Upward buoyant force
Weight
Wood
CATALÀ
Vaixell
Moneda
Suro
Cullera
Pedra
Submarí
Vessar
Fusta
SUMMARY
Archimedes’ principle
Statement: when a body is immersed in a fluid, it experiences an upward buoyant
force equal to the weight of the displaced fluid.
Example: An orange immersed in a container with 500 ml of water will make the
water level rise up to 650 ml. That means that the orange experiences an upward
buoyant force equal to the weight of 150 ml of water.
= weight of 150 ml
650 ml
650-500=150 ml
500 ml
Buoyancy
From Archimedes’ principle, we can deduce that when a body is immersed in a
fluid, it experiences two forces:
-
Weight, which acts vertically downwards.
Upward buoyant force, which acts vertically upwards.
Upward buoyant force
Weight of the body
Therefore, there are three different cases (W is weight and Bf is upward buoyant
force):
1) W > Bf → the body sinks.
2) W < Bf → the body floats.
3) W = Bf → the body sinks but it doesn’t arrive to the bottom.