Telescopic three-line pendulum with adjustable three-line space

Abstract

The invention discloses a telescopic three-line pendulum with an adjustable three-line space, which comprises a base, a vertical rod fixed on the base, a cross rod fixed at the upper end of the vertical rod, an upper disc, a lower disc and three suspension lines connecting the upper disc and the lower disc, wherein the peripheral surface of the lower disc are uniformly provided with three lower disc mounting holes, the center lines of the three lower disc mounting holes are intersected with one point on the axis of the lower disc, lower disc telescopic rods are correspondingly mounted in the three lower disc mounting holes in a sliding manner respectively, and the lower ends of the suspension lines are fixedly connected to the outer ends of the lower disc telescopic rods. The device is simple in structure and convenient to operate, and the distance between the suspension line and the center can be adjusted to verify the rotational inertia of rigid bodies of different sizes. The spatialrange determined by the suspension lines is changed by adjusting the suspension lines, so that the three-line pendulum is suitable for to-be-measured rigid bodies of different sizes, the size and occupied space of the three-line pendulum can be effectively reduced, and the cost is reduced. The three-line pendulum can also accurately verify the rotational inertia vertical axis theorem of the rigidbody.

Description

technical field [0001] The invention belongs to the technical field of mechanical experiment instruments, in particular to a telescopic three-wire space-adjustable three-wire pendulum. 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] 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 pla...

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Problems solved by technology

[0003] 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, so the rigid body to be measured The maximum size of the rigid body 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; of course, it can also be passed Make the three-wire pendulum larger to solve the above problems, but this will increase the size of the three-wire pendulum, increase the space occupied, and increase the cost

[0004] In addition, 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. Therefore, there is an urgent need for a convenient and accurate verification test. The three-line pendulum test instrument for the convenience of verifying the vertical axis theorem of rigid body moment of inertia

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