Device and method for demonstrating several basic contents of rotating rigid body

Abstract

The invention discloses a device and a method for demonstrating several basic contents of a rotating rigid body. The device mainly comprises a camera, white pebbles, equidistant helices, a piece of white paper and the like; the device is characterized in that the pebbles are white pebbles, wherein the surfaces of the pebbles are coated with small black square spots by equal spacing in a dot-matrixform; along long axes of the pebbles, the red equidistant helices are painted on the surfaces of the pebbles; top regions of the ends that curvature radii of the pebbles are great are coated by a blue stamp pad; and the white paper is stuck on a horizontal tabletop. During demonstrating, pictures of the pebbles on the white paper are recorded via a lens of the camera, the pebbles are placed on the white paper in a mode that the long axes are horizontally kept, and the pebbles are driven to do high-speed rotation around vertical axes through two hands, so that a track of the stamp pad, namelynutation and precession rules, can leave on the white paper, and such phenomenons that the helices around the long axes move along the long axes and the like can be observed; the device is simple andeasy to make and is obvious in effect; more educational functions can be increased when the device is applied to education; and the device can be also popularized in the field of science and educationinnovation.

Description

technical field [0001] This patent relates to a demonstration device and method for demonstrating several basic contents of a rotating rigid body, and belongs to the field of physical experimental instruments. Background technique [0002] Rigid body fixed-point motion is the key content of rigid body mechanics. The translation and rotation around the center of mass of the rigid body further expand the fixed-point motion to general motion. In the past, the trajectory demonstration of precession and nutation of fixed-point motion was difficult to achieve, and there was also a lack of symmetry for rigid bodies. The angular velocity and angular momentum change law demonstration device of the shaft, the inventor gave a demonstration and analysis of the angular momentum change law when the moment suddenly changed. The prior art lacks the demonstration of the precession and nutation of the rigid body, the demonstration experiment of changing the angular momentum of the rigid body ...

AI Technical Summary

Problems solved by technology

[0002] Rigid body fixed-point motion is the key content of rigid body mechanics. For the translation and rotation around the center of mass of a rigid body, fixed-point motion is further expanded into general motion. In the past, it was difficult to realize the trajectory demonstration of precession and nutation of fixed-point motion, and there was also a lack of symmetry for rigid bodies. Angular velocity and angular momentum change law demonstration device of the shaft. The inventor has given a demonstration and analysis of the angular momentum change law when the torque changes suddenly. The existing technology lacks demonstrations of precession and nutation of rigid bodies, and also lacks the demonstration experiment of changing the angular momentum of rigid bodies from around the short axis to around the long axis, and the intuitive demonstration of the right-hand rule relationship of angular velocity. This patent will solve this problem

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