Three-line pendulum capable of verifying rigid body rotational inertia perpendicular axis theorem

Abstract

The invention discloses a three-line pendulum capable of verifying the rigid body rotational inertia perpendicular axis theorem. The three-line pendulum comprises a base, a vertical rod fixed to the base, a cross rod fixed to the upper end of the vertical rod, an upper disc, a lower disc and three suspension lines arranged between the upper disc and the lower disc, and further comprises a test piece support frame, a support part in contact with the lower disc is arranged on the test piece support frame, and a test piece clamping groove is vertically formed in the test piece support frame; thethree-line pendulum further comprises a perpendicular axis theorem test piece matched with the test piece clamping groove, and the perpendicular axis theorem test piece is a sheet-like object which has two adjacent straight sides which are perpendicular to each other. The three-line pendulum is simple in structure and convenient to operate and can be used for verifying the rigid body rotational inertia perpendicular axis theorem; the suspension lines can be adjusted to make the three-line pendulum applicable to to-be-tested rigid bodies with different sizes, the size of the three-line pendulumand the occupied space are effectively reduced, and thus the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of mechanical experiment instruments, and in particular relates to a three-line pendulum capable of verifying the vertical axis theorem of rigid body moment of inertia. Background technique [0002] The three-wire pendulum is a mechanical experimental instrument commonly used to measure the moment of inertia of rigid bodies in university physics experiments. It includes a bracket, an upper plate, a lower plate, and three suspension wires between the upper plate and the lower plate. To measure the rigid body, the moment of inertia of the object to be measured is measured by using the changes in the rotational cycle and mass of the three-wire pendulum before and after placing the rigid body to be measured. [0003] In the current university physics experiments, the verification test of the parallel axis theorem of the rigid body moment of inertia is generally done, but the verification test of the vertical axi...

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Problems solved by technology

[0003] In the current university physics experiments, the verification test of the parallel axis theorem of the rigid body moment of inertia is generally done, but the verification test of the vertical axis theorem of the rigid body moment of inertia is not done. Therefore, there is an urgent need for a method that can verify the vertical axis theorem of the rigid body moment of inertia three-wire pendulum testing instrument

[0004] In addition, the size of the rigid body to be measured on the three-wire pendulum is limited by the space determined by the three suspension wires. The distance from the three fixed points of the three-wire pendulum suspension wires to the center of the lower plate in the prior art is fixed. The maximum size of the rigid body to be tested is also fixed, so when the size of the rigid body to be tested exceeds the spatial range determined by the three suspension wires, it will interfere with the suspension wires, so it cannot be used and measured, and the test cannot be carried out; The above problems can be solved by designing the three-wire pendulum to be larger, but this will cause the volume of the three-wire pendulum to increase, increase the space occupied, and increase the cost.

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