Videos of classroom physics demonstrations F. Frising, P. Thiry and R. Sporken Department of Physics...
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Transcript of Videos of classroom physics demonstrations F. Frising, P. Thiry and R. Sporken Department of Physics...
Videos of classroom physics demonstrations
F. Frising, P. Thiry and R. Sporken
Department of PhysicsUniversity of Namur (FUNDP)Rue de Bruxelles 61B-5000 Namur Belgium
The « Foucault pendulum »
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The « Foucault pendulum »
t = 0 t1
t = 0v
co r r = 0
F = 0
F corF
FF cf F rea lF rea l
F cf
v r
The real Foucault pendulum
Precession rate in Belgium =1 degree in 5
minutes
T = 24 h / sin, the latitude
Trajectories in rotating frames
x , (T = 1s)
, (T = 1s)
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Trajectories in rotating frames
F cor
F cor
F corF
F
F
F cf
F cf0 .3 m
Fcf v r
v r
v in it
v r
x , (T = 1s)
, (T = 1s)
The map of the world
The gyroscope
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The gyroscope
L m g
r
p
= 14.4 s-1
I = 0.0191 kg m2
L = 0.275 kg m2 s -1 r = 0.053 mm = 0.150 kgTp = 2L/(mgr) = 22 s
Tp exp = 26 s
The Maxwell wheel
, L, = r x T x
m g
r
RT
m gr
T
, Lx = r x T
The ring is falling down.
The ring is climbing up.
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The Maxwell wheel : time measurement
2
2
down
R2h 1rt
g
8.1 s
R = 0.0575 mr = 0.0028 mh = 0.76 m
For a ring :
texp = 7.7 s
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The Maxwell wheel : the ring and the disk
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