CN206097619U - Simple pendulum presentation device - Google Patents

Abstract

The utility model belongs to the technical field of teaching demonstration, in particular to a single pendulum demonstration device. This simple pendulum demonstration device comprises base plate (1), and described base plate (1) is provided with upright transparent plate (2), and the middle position of transparent plate (2) is provided with vertical guide rail (21), guide rail (21) A telescopic rod (3) is arranged inside, and the telescopic rod (3) is fixed in the guide rail (21) by two knobs (4). The telescopic rod (3) is provided with a crossbar (31), and the middle The position is connected with the telescopic rod (3), and a single pendulum is arranged at both ends of the cross bar (31), both of which are connected with the telescopic rod (3) through the winch mechanism (34), and the two pendulums are divided into a No. Simple pendulum (32) and No. 2 simple pendulum (33). The utility model has the advantages of simple structure and convenient use, and can simultaneously demonstrate the motion of two simple pendulums with different pendulum lengths or different pendulum angles, and can demonstrate the motion of two simple pendulums with the same linear velocity but different angular velocities.

Description

Simple pendulum demonstration device

technical field

The utility model belongs to the technical field of teaching demonstration, in particular to a single pendulum demonstration device.

Background technique

A simple pendulum is a device that can produce reciprocating swings. One end of a weightless thin rod or an inextensible thin flexible rope is suspended at a certain point in the gravitational field, and a heavy ball is fixed at the other end to form a simple pendulum. The periodic formula for the approximate motion of a simple pendulum: where L is the length of the pendulum and g is the local acceleration due to gravity. And the motion knowledge of simple pendulum is a very important part of teaching. The utility model with the application number 201520398422.9 published on September 23, 2015 discloses a pendulum, which includes a base (1), a crossbar (2), a tension sensor (4), a monocycloid (3), The pendulum shaft (5), the photoelectric counter (6), the pendulum ball (7) and the vertical rod (9) vertically fixed on the base (1) have the function of timing, but they lack the ability to simultaneously demonstrate different pendulum lengths or Motion of two pendulums with different pendulum angles.

Utility model content

The purpose of the utility model is to provide a simple pendulum demonstration device for the deficiencies of the prior art, which can simultaneously demonstrate the motion of two single pendulums with different pendulum lengths or different pendulum angles.

In order to solve the above problems, the utility model adopts the following technical solutions:

A single pendulum demonstration device, comprising a bottom plate, an upright transparent plate is arranged on the bottom plate, a vertical guide rail is arranged in the middle of the transparent plate, a telescopic rod is arranged in the guide rail, and the telescopic rod is fixed in the guide rail by two knobs , the telescopic rod is provided with a cross bar, the middle position of the cross bar is connected with the telescopic rod, and a single pendulum is arranged at each end of the cross bar, and the two single pendulums are connected with the telescopic rod through the winch mechanism, and the two single pendulums are divided into one No. 1 pendulum and No. 2 pendulum.

By adjusting the winch mechanism to change the pendulum length, under the perspective of the transparent plate, the movement of the two pendulums can be clearly observed. This device can be used to observe the motion of two simple pendulums with different pendulum lengths. Of course, it is also possible to make the two pendulums have the same length and different swing angles, and then observe the movement of the two pendulums. Therefore, it is possible to demonstrate various forms of pendulum movement, which is conducive to students' deep understanding and mastery of the movement of simple pendulum.

The transparent plate is provided with a strip-shaped groove, the groove is provided with an intercepting rod capable of 90° movement, and the bottom plate is provided with a No. 1 folding plate capable of 90° movement on the side with the groove. The No. 1 folding plate is turned over by the knob. The folding axis of the No. 1 folding plate coincides with the plane where the intercepting rod moves. The other side of the bottom plate is equipped with the No. 2 folding The folding plate is realized by the knob, and the folding axis of the second folding plate is in the same plane as the telescopic rod.

Break down the intercepting rod, and make the No. 1 and No. 2 folding plates in the vertical state, and when the two pendulums with the same pendulum length and pendulum angle move along the cycloid, when the No. 1 pendulum touches the intercepting Before the rod, the motion states of the two pendulums are the same. And when the No. 1 pendulum touches the intercepting rod, its radius of rotation changes, and because the linear velocity remains unchanged, the angular velocity becomes larger, so it turns through more angles in the same time. Let’s count from the position of the interceptor bar. The two pendulums pass through the same angle to reach the folded plate, but the angular velocity of the pendulum No. 1 is higher, so it touches the folded plate No. 1 first. It is thus possible to demonstrate the motion of a pendulum with the same linear velocity but different angular velocities.

As an improvement, scales are provided on the telescopic rod. It is convenient to adjust the height of the telescopic rod, and can measure the length of the cycloid.

As an improvement, the hoisting mechanism includes a conical head and a winding knob, and the cycloid passes through the conical head and is connected to the winding knob. The length of the cycloid can be increased or shortened by turning the winding knob.

The utility model has the advantages of simple structure and convenient use, and can simultaneously demonstrate the motion of two simple pendulums with different pendulum lengths or different pendulum angles, and can demonstrate the motion of two simple pendulums with the same linear velocity but different angular velocities.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a perspective view of one side of the utility model.

Fig. 2 is a schematic perspective view of the other side of the utility model.

In the figure: 1-bottom plate; 12 No. 1 folding board; 13 No. 2 folding board; 2-transparent board; 21- guide rail; 22- groove; 3- telescopic rod; Pendulum; 33-No. 2 single pendulum; 34-hoisting mechanism; 35-scale; 36-tapered head; 37-winding knob; 4-knob; 5-interceptor rod.

detailed description

Example 1

As shown in Figures 1 and 2, a single pendulum demonstration device includes a bottom plate 1, on which a vertical transparent plate 2 is arranged, and a vertical guide rail 21 is arranged in the middle of the transparent plate 2, and inside the guide rail 21 Telescopic rod 3 is provided, and telescopic rod 3 is fixed in guide rail 21 by two knobs 4, and telescopic rod 3 is provided with crossbar 31, and the middle position of crossbar 31 is connected with telescopic rod 3, and crossbar 31 two ends are respectively provided with One simple pendulum, two simple pendulums are all connected to the telescopic rod 3 through the winch mechanism 34, and the two simple pendulums are divided into No. 1 single pendulum 32 and No. 2 single pendulum 33.

By adjusting the hoisting mechanism 34 to change the pendulum length, under the see-through effect of the transparent plate 2, the movement of the two pendulums can be clearly observed.

The transparent plate 2 is provided with a strip-shaped groove 22, and the intercepting rod 5 capable of 90° movement is arranged in the groove 22, and the bottom plate 1 is provided with a 90° movement bar on the side with the groove 22. The No. 1 turning plate 12, the No. 1 turning plate 12 realizes turning over by the knob 4, the turning axis of the No. 1 turning plate 12 coincides with the plane where the intercepting rod 5 moves, and the bottom plate 1 is provided with a 90 ° The No. 2 turning plate 13 that moves, the No. 2 turning plate 13 realizes turning over by the knob 4, and the turning axis of the No. 2 turning plate 13 is coplanar with the telescopic rod 3.

Break off the intercepting rod 5, and make the No. 1 folded plate 12 and the No. 2 folded plate 13 both in the vertical state, and when two pendulums with the same pendulum length and pendulum angle move along the cycloid, the pendulum on the No. 1 pendulum Before 32 touches interceptor bar 5, the motion states of two simple pendulums are identical. And when the No. 1 single pendulum 32 touched the intercepting rod 5, its radius of rotation changed, and the angular velocity became larger because the linear velocity was constant, so more angles were turned in the same time. May wish to count from the position of the intercepting rod 5, the two pendulums reach the folded plate through the same angle, but the angular velocity of the No. 1 single pendulum 32 is relatively large, so it touches the No. 1 folded plate first.

Scale 35 is arranged on telescoping rod 3 . It is convenient to adjust the height of the telescopic rod 3, and can measure the length of the cycloid.

The hoisting mechanism 34 includes a conical head 36 and a winding knob 37 , and the cycloid passes through the conical head 36 and is connected to the winding knob 37 . The winding knob 37 rotates to increase or shorten the length of the cycloid.

Claims (3)

1. a kind of single pendulum demonstration apparatus, it is characterised in that：Including base plate (1), the transparent panel of setting is provided with the base plate (1) (2), the centre position of transparent panel (2) is provided with vertical guide rail (21), guide rail (21) and is provided with expansion link (3), expansion link (3) it is fixed in guide rail (21) by two knobs (4), cross bar (31), the interposition of cross bar (31) is provided with expansion link (3) Put and be connected with expansion link (3), cross bar (31) two ends are each provided with a single pendulum, two single pendulums pass through hoisting mechanism (34) and stretch Contracting bar (3) is connected, and two single pendulums are divided into a single pendulum (32) and No. two single pendulums (33)；Strip is provided with the transparent panel (2) 90 ° of interception bars (5) for moving of energy are provided with the groove (22) of shape, groove (22), base plate (1) sets in the side of fluted (22) 90 ° of turnover boards (12) for moving of energy are equipped with, a turnover board (12) is realized turning down by knob (4), a turnover board (12) plane that turnover axis is moved with interception bar (5) overlaps, and base plate (1) is provided with opposite side can 90 ° of No. two for moving Turnover board (13), No. two turnover boards (13) are realized turning down by knob (4), the turnover axis and expansion link of No. two turnover boards (13) (3) it is coplanar.

2. single pendulum demonstration apparatus as claimed in claim 1, it is characterised in that：Scale (35) is provided with the expansion link (3).

3. single pendulum demonstration apparatus as claimed in claim 1, it is characterised in that：The hoisting mechanism (34) is including conical head (36), spiral knob (37), cycloid is connected on spiral knob (37) through conical head (36).