3B Scientific Supplementary Kit for Rotating System on Air Bed User Manual

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

Fig. 1 Set-up for a torsional oscillator.

Fig. 2 Experiment set-up for determining moment of inertia of transverse beam with additional masses, using a laser reflection
sensor (U8533380 ) and á digital counter (U8533341).

Elwe Didactic GmbH • Steinfelsstr. 6 • 08248 Klingenthal • Germany • www.elwedidactic.com

3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com

Subject to technical amendment

© Copyright 2008 3B Scientific GmbH