Supplementary Kit for Rotating System on Air Bed
3B SCIENTIFIC
®
PHYSICS
Supplementary Kit for Rotating System on Air Bed U8405690
Instruction Sheet
08/08 ALF
1 Rotating disc
2 Torsion springs
3 Support bracket with universal
clamp
1. Description
The supplementary kit for the rotating system on air
bed (U8405680) is designed for the study of frictionless
rotational motion with a larger rotating disc.
The rotating disc has an angular scale pattern on its
underside, which can be detected by a laser reflection
sensor (U8533380) in order to trace the rotational
motion in conjunction with an interface to a
computer.
Because of the large diameter of the rotating disc it is
also possible to perform time measurements with a
mechanical stop-watch.
2. Equipment supplied
1 Rotating disc with angular scale
1 Support bracket
1 Universal clamp
1 Set of coupling springs with magnet
3. Technical data
Rotating disc diameter: 350 mm
Moment of inertia of
rotating disc: 2.2 g/m
Typical duration of
oscillations: 20 s to 2 min
Coupling springs: 1 N, 2 N, 5 N
3. Operation
• To set up the basic apparatus, see the instruction
sheet for U8405680.
Setting up a torsional oscillator (see Fig. 1)
• Fix the universal clamp to the support bracket.
• Fit the support bracket into the supporting tube’s
base.
• Place the large rotating disc on the air-bearing
unit and turn it to zero (0°).
• Fix a torsion spring into the universal clamp and
connect it to the magnet on the multiple pulley.
• Turn the rotating disc through a measured angle
from its rest position and then let it go so that it
starts oscillating.
2
approx.
1
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