RVFM Variable Inertia Bar

This apparatus helps to demonstrate that the torque required to accelerate a flywheel depends upon its moment of inertia rather than its mass.

A steel bar 790 x 12mm is mounted at its centre on a sleeved spindle. The spindle is extended through a sleeve so that the bar may be rotated by a weight and string. Heavy adjustable masses are mounted on each end of the bar and may be clamped at any desired position enabling inertia to be varied.

• Demonstrates that torque required to accelerate a flywheel depends on its moment of inertia rather than its mass
• Steel bar 790 x 12mm mounted at its centre on a sleeved spindle
• Heavy adjustable masses can be clamped at any position enabling inertia to be varied