CN2613841Y

CN2613841Y - Curved desk and rolling disk demonstration experiment apparatus

Info

Publication number: CN2613841Y
Application number: CN 03244530
Authority: CN
Inventors: 路峻岭; 汪荣宝
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2003-04-04
Filing date: 2003-04-04
Publication date: 2004-04-28
Anticipated expiration: 2013-04-04

Abstract

A curved face desk rolling disk demonstrating laboratory instrument belonging to the teaching laboratory instrument field comprises a curved face desk, a starter and two disks (short cylinder), which is characterized in that the desktop of the curved face desk is made to an arc with a certain radius of curvature, and a starter is arranged on one side to stop or release the disk used in a experiment. The quality, the radius and the thickness of the two disks are all the same, through holes more than two for example six with the same diameter and even-distributed are provided on the end faces of the disk, and the through holes on one of the disk are close to the center and the through holes on the other are far form the center.

Description

Curved desk rolling disk demonstration test instrument

Technical field

The utility model relates to curved desk rolling disk demonstration test instrument, belongs to college physics teaching lecture experiment instrument field.

Background technology

The physics principle explanation, two rigid body right cylinders that quality is all identical with radius, if their moment of inertia difference, speed was with inequality when then they made the plane parallel rolling movement.At present in the college teaching, cooperate theoretical lecturing, the cylinder of useful two different moment of inertia is along the lecture experiment that rolls under the straight inclined-plane, but can not be oversize because of the length on straight inclined-plane, so the difference when rolling under two cylinders is not obvious, it is not good enough to demonstrate effect.

The utility model content

The purpose of this utility model is to want to provide a kind of simple in structure, tangible rolling disk demonstration test instrument of experiment effect.This experiment instrument is made up of curved desk, starter and two disks (short cylinder).The desktop of curved desk is made the arc of certain curvature radius, at the one end starter is set, in order to the disk that blocks or release experiment is used.The quality of two disks, radius and thickness are all identical, and two disks all are equipped with on end face＞through hole of 2 (as 6) and equally distributed same diameter, make all through hole decenterings of a dish nearer, and another decentering is far away.

Like this, two disks must be different around the moment of inertia of its central shaft.During experiment, an end that two disks is placed on curved desk is fixed with starter, rotates starter and discharges disk.Two disks promptly along the arcwall face do reciprocal rolling back and forth of curved desk, after several times are reciprocal, can be found out the notable difference of two disks because of the different rolling distances that form of speed.This experiment instrument is simple in structure, and experiment effect is obvious.

Description of drawings:

Fig. 1 is the side view of curved desk.

Fig. 2 is the vertical view of curved desk.

Fig. 3 is the structural representation of the little disk of moment of inertia.

Fig. 4 is the structural representation of the big disk of moment of inertia.

Embodiment:

Embodiment is as follows with reference to description of drawings: among Fig. 1,2, and the 1st, have the curved desk of arcwall face; The 2nd, starter is installed in an end of curved desk, can rotate with the fixing of control disk or discharges around its stationary shaft; The length of curved desk is 1180mm, wide 320mm, and the lowest part of arcwall face is apart from bottom surface 60mm; The radius-of-curvature of bent desktop arcwall face is about 1400mm.Two rolling disk aluminium alloy materials are made, diameter of phi=88mm, and thick H=33mm, the disk that moment of inertia is little is made a call to the through hole of six equally distributed Φ 14mm on the circumference of Φ 60mm, as shown in Figure 3; The disk that moment of inertia is big is made a call to the through hole of six equally distributed Φ 14mm on the circumference of Φ 30mm, as shown in Figure 4.In case of necessity, can be with density p 〉=9 gram per centimeters ³The alloy steel cylinder (Φ 14mm * 33mm) fills in 12 through holes and makes moment of inertia that opposite variation take place.

Claims

1, a kind of curved desk rolling disk demonstration test instrument, form by curved desk, starter and two disks, it is characterized in that the desktop of curved desk makes the arc of certain curvature radius, at the one end starter is set, in order to the disk that blocks or release experiment is used, quality, radius and the thickness of two disks are all identical, the through hole of all being equipped with on the end face of disk＞2 and equally distributed same diameter, make all through hole decenterings of a dish nearer, and another decentering is far away.