Comprehensive revision notes on Materials from the Edexcel Physics A Level syllabus from an A* student in the 23/24 exam cycle. Complete with labelled diagrams and thoroughly fact checked and up to date.
, ① Upthrust
This is the upward force acting on an
object in a fluid due to different
pressures beingexerted on it .
Ap =
liquid pressure
& :
fluid density
Ap =
pgAh g = gravitational field strength
Bh :
height
Archimedes' principle states that the upthrust experienced by an object
is equal to the weight of the fluid it displaces.
Upthrust =
weight of fluid displaced
o= density of fluid
V volume of displaced
-Upthust Vg
=
=
fluid
9 = gravitational field strength
·
If object an is floating in a liquid ,
its weight mustesual its
upthrust .
② Stoke's Low
The resistive force experienced by an object moving
in a fluid is
known as the visions
drag force
.
Stone's haw states that the visions dragforce (F) ca be calculated by :
7 =
viscosity of fluid
E F =
Gayr ~ =
~ =
radius of object
terminal velocity of object
-
.
2 (Psolid-Pfinid) grh
i
=
9v
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