3B Scientific Torsion Axle - Manual

3B SCIENTIFIC® PHYSICS
1
Torsion Axle U20050
Instruction sheet
03/11 Alf
1 Circular disc
2 Cross bar
3 Mount for test bodies
4 Spirit level
5 Bracket with coiled spring
6 Support rod
7 Weights
1. Safety instructions
If the coiled spring is too tightly wound, there is the
danger that high centrifugal forces cause the test
bodies to be hurdled away.
• Do not displace the test bodies more than a maxi-
mum of 360° (180° is recommended).
2. Description
The torsion axle with its corresponding accessories
and parts are used to investigate rotational oscilla-
tion and for determining the moments of inertia of
various sample objects from the period of oscillation.
The torsion axle consists of a shaft with twin ball races
which is coupled to a bracket by a coiled spring. A
support rod permits assembly on a stand base or a
table clamp. A spirit level is provided so that the tor-
sion axle can be aligned to the horizontal. The test
bodies are a cross bar with weights that can be
moved along its length and a circular disc with one
hole in the centre and eight away from the centre for
determining moments of inertia for eccentric axes of
rotation and confirming Steiner’s theorem.
3. Equipment supplied
1 shaft with bracket, coiled spring, support rod and
mount for test bodies
1 cross bar
2 weights
1 circular disc
4. Technical data
Restoring torque of the spring: 0.028 Nm/rad
Height of the torsion axle: approx. 200 mm
Cross bar:
Length: 620 mm
Mass: approx. 135 g
Weights: 260 g each
Circular disc:
Diameter: 320 mm
Mass: 495 g
Boreholes: 9
Borehole spacing:
20 mm