My name is Blythe, and I will be explaining a little bit about Archimedes'
Principle
So Archimedes was a Greek mathematician and physicist who was best
known for his principle regarding buoyancy
 
His principle states that any completely
or partially submerged object in a fluid
is acted upon by an upward or buoyant
force
this buoyant force is equal to the weight
the displaced fluid
let's apply it to the following
question: if you have a chunk of lead in
the chunk of wood that at the same
volume so same size same shape
et cetera
what happens to each object when they're
placed in water
well the chunk of lead have a lesser
greater or equal buoyant force as the
chunk of wood
starting out by drawing
some diagrams
here we can see lead and wood right
lead and wood they're the same volume so
they're going to be displacing
the same amount fluid so because of
this the buoyant force acting on each
object will be for 4 Newtons, Archimedes' principal
states that the buoyant force acting on it
object is equal to the weight of the
liquid displaced
and the liquid displaced is based on the
volume
so if the volume at these two objects is
the same which it is
than the buoyant force is going to be equal,
but
since lead is heavier than wood, lead has
a
greater weight acting down
than wood does so about 8 Newtons for example
and that overpowers (it's just greater) the buoyant force
and causes lead to sink
because 8 Newtons is greater than
4 Newtons. On the other hand
wood is not as heavy as lead so about
maybe 4 Newtons
and since 4 Newtons of buoyant force is 
equal to
4 Newtons of weight pushing down, the wood
is not going to move
it's going to stay stationary and
therefore float
So hopefully, now you know who Archimedes was, what his
principle states and how it applies to
some objects
thanks for watching and I hope
you enjoyed the video
