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∑
=
a
m
F
v
v
r
T
π
2
=
Period of circular motion
2
2
1
r
m
m
G
F
=
W
v
v
a
c
2
=
Centripetal acceleration
Gravitational force
mg
=
)
(
y
apparent
a
g
m
W
+
=
r
mv
F
2
Weight
N
s
s
F
f
μ
=
r
c
=
m
G
r
e
R di
f i
l
bi
Centripetal force
F i
i
l f
N
k
k
F
f
μ
=
2
v
=
Radius of circular orbit
Frictional forces
)
(
W
h
h
mg
=
Work done by
d
F
d
⋅
=
W
KE
W
Δ
=
Work
Grav
f
o
−
mgh
=
G
PE
gravity
Gravitational potential
energy
m
p
mv
2
KE
2
2
2
1
=
=
Kinetic energy
PE
KE
W
NC
Δ
+
Δ
=
o
f
NC
E
E
W
−
=
Work – Energy theorem