Three-line pendulum facilitating control of pendulum angle

Abstract

The invention discloses a three-line pendulum facilitating control of a pendulum angle. The three-line pendulum provided by the invention comprises a support, a three-line pendulum, a photoelectric gate and a timer, and further comprises a miniaturized laser and an angle scale, wherein the miniaturized laser is fixed at the center of the lower surface of a lower disc, the angle scale is fixed at a position, which has the same height as the miniaturized laser, on a vertical rod of the support, the miniaturized laser emits laser rays towards the angle scale along a horizontal direction, and the miniaturized laser swings along with the lower disc and indicates the pendulum angle of the lower disc through position change of a laser line on the angle scale. The structure is simple, the practicality and the convenience are high, the pendulum angle of the three-line pendulum can be visually indicated, an experimenter can conveniently control the size of the pendulum angle, and the moment of inertia of a rigid body can be accurately determined.

Description

technical field [0001] The invention relates to a moment of inertia measuring instrument, in particular to a three-wire pendulum which is beneficial to control the pendulum angle. Background technique [0002] The three-wire pendulum is a common mechanical experiment instrument for measuring the moment of inertia of a rigid body. It is generally composed of an upper disc, a lower disc and three suspension wires connecting the upper disc and the lower disc. The lower disc is used to place the object to be measured. The change of the rotation period of the three-wire pendulum before and after the object to be measured is used to measure the moment of inertia of the object to be measured. During the experiment, the disc under the three-wire swing is required to swing at a small angle, and the swing angle should not exceed 5 0 . However, the existing three-wire pendulum does not have a swing angle indicator and control device, which leads to the inability to accurately control...

AI Technical Summary

Problems solved by technology

However, the existing three-wire pendulum does not have a swing angle indicator and control device, which leads to the inability to accurately control the swing angle of the lower disk during the experiment. Many students will have a swing angle greater than 5 0 , thus increasing the experimental error

Images