Rigid body accurate positioning three-line pendulum for verifying rigid body rotational inertia vertical axis theorem

Abstract

The invention discloses a rigid body accurate positioning three-line pendulum for verifying a rigid body rotational inertia vertical axis theorem. The device comprises a base, a vertical rod fixed onthe base, a cross rod fixed at 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 vertical axis theorem test piece placed on the lower disc, wherein the vertical axis theorem test piece is a thin-plate-shaped object, two adjacent and mutually perpendicular planes are arranged on the periphery of the thin-plate-shaped object, positioning pin shafts are correspondingly arranged on the two planes of the vertical axis theorem test piece, and a positioning pin hole matched with the first pin shaft or the second pin shaft is formed in the center of the lower disc, and the axis of the positioning pin hole is perpendicular to the lower disc. The three-line pendulum is simple in structure, convenient to operate and accurate in rigid body positioning, and facilitates verification of the rigid body rotational inertia vertical axis theorem. In addition, the three suspension lines areadjustable so as to adapt to to-be-meausred rigid bodies of different sizes, the size and occupied space of the three-line pendulum can be 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 rigid body precisely positioned three-line pendulum for verifying the vertical axis theorem of rigid body rotational 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 moment of inertia of the rigid body is generally done, but the veri...

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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 moment of inertia of the rigid body is generally done, but the verification test of the vertical axis theorem of the moment of inertia of the rigid body is not done. Rigid body precise positioning three-wire pendulum test instrument based on rigid body moment of inertia vertical axis theorem

[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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