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Summary OCR A level Physics A 5.2 Circular Motion
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Summary notes for 5.2 Circular Motion including definitions, explanations, diagrams, highlighted key points and equation break downs
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Angular VelocityDefined as the rate of change in
angle
of co = 0
t
when t is equal to one
period ,
T, the object will move
through a whole circle (21T radians )
ooo w
2¥
=
radians
angular velocity in
per second rads
'
w
-
, , ,
frequency is the reciprocal of time period ,
:O w -
_ 21T f-
Centripetalmoin
Any force that keeps a
body moving with uniform speed along a
circular path is called a centripetal force .
Acentripetal force is not an additional force it ,
comes from the
forces already acting on the object that is in circular motion
the centripetal force always acts perpendicular to the
velocity of
the object Therefore
.
,
the centripetal force has no
component in the
object and its
direction of motion , so no work is done on the speed
remains constant
f- 80 in one complete rotation V= 21T r
§ T
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