Inertia in Rotational Motion Apparatus
This apparatus enables experiments to be performed on rotational motion in general. Weights
can be fitted to a rotating rod at marked distances from the centre. A dumbbellâ€shaped
arrangement is thus created; the inertia properties of this arrangement can be changed easily
and recalculated. The arrangement is fitted to a low friction ball bearing mounted rotating
drum. The system is accelerated by a metal weight attached to a cord wrapped around the
drum. The time taken for the weight to fall is measured using a stopwatch, the moment of
inertia of the object can then be determined. The experiment is set up quickly using table
clamps and stands.
Learning Objectives/Outputs
Determination of the moment of inertia of various bodies
Influence of the rotating mass on the moment of inertia
Influence of the radius of rotation on the moment of inertia
Comparison of the moments of inertia of solid and hollow cylinders of the same weight
and outside diameter
Technical Data:
Rotating rod: 550mm long, D=10mm; Weights: 100g, 200g, 400g; Solid cylinder
(diameter: D=120mm; mass: 900g); Hollow cylinder (outer diameter: D=120mm; inner
diameter: d=110mm; mass: 0.9kg); Weight for the drive: 1N
Or Equivalent
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