Rotating System on Air Bed (230 V, 50 / 60 Hz)

Apparatus for investigating frictionless rotation. 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.

• Protractor scale: 0 – 360°
• Scale divisions: 1°
• Length of cross bar: ca. 440 mm
• Radii of perforations: 30 – 210 mm
• Separation of perforations: 20 mm
• Radii of multiple pulley: 5,0 mm / 10,0 mm / 15,0 mm
• Moment of inertia of disc with cross bar: 0,16 g m² approx.
• Maximum moment of inertia: 7,1 g m² approx.
• Minimum driving torque: 0,05 mN m approx.
• Maximum driving torque: 0,60 mN 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 (2 × 12,5 g, 2 × 25 g, 2 × 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