CN202404804U

CN202404804U - Horizontal projectile motion demonstration instrument

Info

Publication number: CN202404804U
Application number: CN201120578124XU
Authority: CN
Inventors: 黄天逸
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-12-31
Filing date: 2011-12-31
Publication date: 2012-08-29
Anticipated expiration: 2021-12-31

Abstract

The utility model belongs to teaching instruments and particularly relates to a horizontal projectile motion demonstration instrument. The demonstration instrument comprises a bracket (1), a flat plate (2), a slide way (4) and a ball (5); the slide way (4) is positioned above the lateral part of the flat plate (2); a cross rod (3) is arranged on the flat plate (2); buckles (31) are arranged at two ends of the cross rod (3); the cross rod (3) is fixed on the flat plate (2) through the buckles (31); a row of pen points (32) are arranged on the cross rod (3) toward one plane of the flat plate (2); the pen points (32) are movably connected with the cross rod (3); and gaps among the pen points (32) are smaller than the diameter of the ball (5). The demonstration instrument has the advantages of simple structure, convenience and practicability.

Description

A kind of level throw motion demonstrator

Technical field

The utility model belongs to instruments used for education, particularly a kind of level throw motion demonstrator.

Background technology

Object is dished out with certain initial velocity along continuous straight runs, if object gravitate only, such motion is called level throw motion.Level throw motion can be regarded the resultant motion of the movement of falling object of linear uniform motion and the vertical direction of horizontal direction as.The object of level throw motion, because suffered bonding force is a constant force, so level throw motion is even speed change curvilinear motion, the movement locus of flat paraboloid is a para-curve.The teacher often adopts the mode of preach when lecturing this knowledge point, the student can only the spoon-feed passive acceptance in ground, and theory does not contact reality, and teaching efficiency is relatively poor, knows the theoretical main cause that can not be applied to practical experience of life though this also is a Most students.Level throw motion demonstrator of the prior art comprises support, flat board, slideway and spin, and slideway is positioned at dull and stereotyped side top, sticks a coordinate paper on the flat board.Whether during demonstration, let spin fall from slideway, with the naked eye judge the position of spin on coordinate paper, and mark with eyesight successively, link up these marks at last, observing it is a para-curve.Such apparatus for demonstrating is demonstrated more loaded down with trivial details, and people's subjectivity influence is bigger when making marks.

The utility model content

The purpose of the utility model provides a kind of level throw motion demonstrator, the tracing point when the automatic mark spin of this demonstrator ability is made level throw motion.

The scheme that the utility model solve the technical problem is: a kind of level throw motion demonstrator; Comprise support, flat board, slideway and spin, slideway is positioned at dull and stereotyped side top, on the said flat board cross bar is set; The two ends of cross bar are provided with buckle; With dull and stereotyped fixing, cross bar is provided with a spread pen head towards the one side of flat board to cross bar through buckle, and nib flexibly connects with cross bar.

During demonstration, let cross bar rest on dull and stereotyped top, let spin make level throw motion, after spin was run into the nib on the cross bar, nib can be taken advantage of a situation and on paper, marked, and concentrated on remembering the position of spin without the demonstrator.Let cross bar let spin make level throw motion along dull and stereotyped toward moving down, nib can be done second mark automatically.Let cross bar along dull and stereotyped toward moving down, nib can be moved the the 3rd, the 4th, the 5th mark certainly, promptly saves worry and accurate.

As further technical scheme, the gap between the said nib is less than the diameter of spin.

Gap between the nib is less than the diameter of spin, and spin can not leaked down from the gap between the nib, can guarantee the success ratio of testing.

In sum, the utlity model has simple in structure, convenient and practical advantage.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structural representation of the utility model cross bar;

Fig. 3 is the enlarged drawing of A portion among Fig. 2.

Embodiment

Like Fig. 1, Fig. 2, shown in Figure 3, a kind of level throw motion demonstrator comprises support 1, flat board 2, slideway 4 and spin 5; Slideway 4 is positioned at dull and stereotyped 2 side top, on the flat board 2 cross bar 3 is set, and the two ends of cross bar 3 are provided with buckle 31; Cross bar 3 is fixing with dull and stereotyped 2 through buckle 31; Cross bar 3 is provided with a spread pen head 32 towards dull and stereotyped 2 one side, and nib 32 flexibly connects with cross bar 3, and the gap between the nib 32 is less than the diameter of spin 5.

Claims

1. level throw motion demonstrator; Comprise support (1), dull and stereotyped (2), slideway (4) and spin (5), slideway (4) is positioned at the side top of flat board (2), it is characterized in that: cross bar (3) is set on the said flat board (2); The two ends of cross bar (3) are provided with buckle (31); Cross bar (3) is fixing through buckle (31) and dull and stereotyped (2), and cross bar (3) is provided with a spread pen head (32) towards the one side of dull and stereotyped (2), and nib (32) flexibly connects with cross bar (3).

2. a kind of level throw motion demonstrator as claimed in claim 1 is characterized in that: the gap between the said nib (32) is less than the diameter of spin (5).