Personalisation of Education by AI and Big Data - Lourdes Guàrdia
Archimedes principle
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3. • The weight of an object in air is its actual weight
• The weight measured when the object is immersed in
a fluid is its apparent weight.
• The apparent weight loss of the object is due to
buoyant force.
4. • When in water, the object
experiences two forces:
(a) The actual weight which acts
downwards
(b) The buoyant force which
acts upwards.
The buoyant force is equal to the apparent
loss in weight.
5. Buoyant force = actual weight – apparent weight
= 25 – 15
= 10 N
• The object displaces a volume of water. The bigger the volume of the object
immersed, the bigger the volume of the liquid displaced.
Volume of liquid displaced = volume of the submerged part of the object
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14. EXPLAIN WHY A BOAT MADE OF STEEL WILL FLOAT IN WATER,
BUT A BLOCK OF STEEL WILL SINK
A block of steel will displaced a small
volume of water only. So the buoyant
force acting on it is smaller than its
weight. Therefore it sinks
• A ship floats on the surface of the sea
because the volume of water displaced by
the ship is sufficiently large. The weight
of water displaced is large so the buoyant
force acting on the ship is also greater.
Weight of ship equal Buoyant force.
Therefore it floats.
15. • Although a ship is constructed of metal, which has a Larger density than
water, its shape is hollow so that the overall density of the ship is smaller than
the sea water.
• As a result, the buoyant force acting on the ship is large enough to support its
weight.
