3B SCIENTIFIC PHYSICS U40205 Instructions D'utilisation page 13

Fig. 4 Mounting of torsional pendulum with scale as viewed from above
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Fig. 5 Set-up of laser pointer for determining zero position (1 wall, 2 laser, 3 mirror)
4.7 Experimental procedure
•
Place the large lead spheres on the outer support
beam at position 1 (see Fig. 6) and wait till the
vibration has settled down (by observing the laser
pointer). Calibrate the zero point if necessary.
•
Move the outer beam to position 2 and start the
measurements.
Fig. 6 Positions of outer support beam (as seen from above) Left: Position 1, Centre: Position 2, Right: Position 3
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2
•
When the small spheres have almost reached their
equilibrium point, move the outer beam to
position 3.
•
Once the small spheres have almost reached their
new equilibrium
measurement.
•
Save the plot of the measurements.
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position, then stop the