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forces
forces in action
pressure and pressure differences
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Cards (12)
a fluid can either be a
liquid
or
gas
if pressure acts on a
bigger area
is will produce a
larger force
the
atmosphere
is a relatively
thin
layer of air around the
earth
the greater the
altitude
the
less dense
the
atmosphere
and the
lower
the
atmospheric pressure
at a
high altitude
there is
less air
above a surface than at
lower altitude
so there is a
smaller weight
of
air
acting on the surface
pressure in a column of liquid depends on
the
height
of the
column
above the
point
the
density
of the
liquid
the
higher
the column the more
dense
the liquid
the greater
weight
above the point
the greater
force
on the
surface
at that point
the greater the
pressure
pressure of a liquid depends on the
depth
for an object to float , the
upthrust
must be
equal
to the objects
weight
if the
upthrust
is less than the objects
weight
it
sinks
size of the upthrust is the same as the
weight
of the
water
displaced
if an bject can displace its own
weight
of
water
, then the
upthrust
will be
equal
to the objects
weight
and
float
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