Rotating System on Air Bed (115 V, 50/60 Hz) -
the investigation of frictionless rotational movements

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Experiment topics:_..

The air-cushioned rotational system is a device system for studying frictionless rotational movements on the following topics::_..

•	Rotational motion: uniform and under constant acceleration
•	Newton's equations of motion for rotational motion
•	Moment of inertia and torque
•	Moment of inertia as determined by experiment
•	Simple harmonic motion of rotating objects_..

The device system is suitable both for illustrative demonstration and for the development of the physical laws of kinematics and dynamics in student exercises and internships at universities.

Productinformation:_..
A small rotating disc with a protractor scale supports a cross bar to which weights can be attached. The disc is supported by a bed of air in which its axis is centred. A driving weight is suspended from a hook at the end of a string that is passed over a single pulley on one side and a multiple pulley on the other. The rotation is very slow and can be measured using a stopwatch by hand. Alternatively, a digital timer may be used. This can be started by a mechanism that is supplied with the kit and halted by a signal from a laser reflection sensor when the wheel passes through angle zero.

Specifications:_..

Protractor scale:	0 – 360°
Scale divisions:	1°
Length of cross bar:	440 mm approx.
Radii of perforations:	30 – 210 mm
Separation of perforations:	20 mm
Radii of multiple pulley:	5 mm / 10 mm / 15 mm
Moment of inertia of
disc with cross bar:	0.9 g m² approx.
Maximum moment of inertia:	7.1 g m² approx.
Minimum driving torque:	0.05 ·10^-3 N m approx.
Maximum driving torque:	0.60 ·10^-3 N m approx.

Contents:_..

1	Air bed
1	Rotating disc with cross bar
1	Multiple pulley
1	Release mechanism
2	S-shaped hooks 1.00g
1	S-shaped hook 2.00 g
1	Set of weights (2x 12.5 g, 2x 25 g, 2x 50 g)
1	Compressor for connection to mains
1	Silicon tubing with by-pass valve (not illustrated)
1	Pulley
1	Stand rod with 3 securing screws and 2 screws for levelling
1	Stand rod with 2 securing screws
1	Stand rod, 250 mm
1	Levelling disc
1	Roll of cotton thread

Note:_..
Experiments for investigating frictionless torsional oscillations and for studying frictionless rotational movements with a large turntable are facilitated by the supplementary set for the air-bed rotational system (Item No.: 1000783).