EM-15 Torsional Pendulum
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The rotational equivalent of the simple pendulum, it consists of a wall support, four interchangeable support wires, and a cast iron disk and ring bob. The ring sits on the disk and doubles the total Moment of Inertia. The dimensions are measured to determine the Moments of Inertia. Three of the support wires are made of steel and one of brass, having the same diameter as the thickest steel wire, so that comparison of the modulus of elasticity is made easy. The wires have clamping hubs at each end to attach them to the collet clamps in the wall support and disk. The Pendulum period ranges from 1 to 5 s depending upon the conditions. The period can be measured with an ET-40 Electronic Stop Clock. A small flag attached to the bob of the Pendulum is adjusted to break the beam of a Photogate set on the bench below. |
Specifications
Disk Cast Iron 25 dia x 1.3 cm Mass 5.7 kg
Ring Cast Iron 25 dia. x 1.3 thick x 3.7 high cm Mass 2.9 kg
Support Wires 0.20, 0.28, 0.40 cm dia steel 0.40 cm dia brass, Length 105 cm
EM-13 Inertia Wheel
| This experiment demonstrates the principles of angular acceleration under a constant torque. The simple geometric shape of the Inertia Wheel simplifies the calculation of the Moment of Inertia. To facilitate measurements, the ball bearing hub of the Wheel can be dismounted from the frame by undoing a single nut. The accelerating torque is supplied by a falling mass attached by a string to a hub on the Inertia Wheel. The falling mass is held on a tripping platform which is tripped to start the experiment. By measuring the acceleration with several masses, the effect of friction can be determined. |
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Specifications
Wheel Aluminum, 25 cm dia. x 1cm thick 1.3 kg
Hub Aluminum, 7 cm dia 0.1 kg
