CN109671339A - A kind of frictional force experimental demonstration device - Google Patents
A kind of frictional force experimental demonstration device Download PDFInfo
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- CN109671339A CN109671339A CN201910142100.0A CN201910142100A CN109671339A CN 109671339 A CN109671339 A CN 109671339A CN 201910142100 A CN201910142100 A CN 201910142100A CN 109671339 A CN109671339 A CN 109671339A
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- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/08—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics
- G09B23/10—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics of solid bodies
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Abstract
The present invention provides a kind of frictional force experimental demonstration devices, comprising: pedestal, experimental bench, friction block, tension sensor, motor driver, wire reels, control device, display screen, image collecting device.Maximum static friction force, force of sliding friction and force of rolling friction and its influence factor can be measured simultaneously using the present apparatus, can also investigate frictional force when friction block moves on the slope；Various frictional force and coefficient of friction can directly display on a display screen, convenient reading, and the data measured are accurate and reliable.
Description
Technical field
The present invention relates to teaching equipment field more particularly to a kind of frictional force experimental demonstration devices.
Background technique
Frictional force is divided into stiction, force of rolling friction, 3 kinds of force of sliding friction.Frictional force especially force of sliding friction
Measurement is always the difficult point of physical experimental design, and the conventional method for measuring frictional force in Physical Experiment has hand traction method, weight
Drawing method, electric traction method etc..It is hand traction method that it is simplest, which to measure frictional force, and principle is to be gone to draw spring scale with hand, is allowed
Object remains a constant speed movement, and the value of frictional force is read from spring scale.Because manpower is difficult to provide constant speed, therefore what is provided leads
Gravitation is difficult to equal with frictional force, and is difficult accurately to read measured value, therefore the measurement of hand traction method has artificial behaviour
The disadvantages of error is big, measurement data is inaccurate caused by making, reading is inconvenient.The principle of weight drawing method is provided using weight
Stable tractive force measures displacement and the time of object, the force of sliding friction of object can be acquired by Newton's second law, with
Hand traction method is compared, and precision increases, the disadvantage is that measurement process needs to record multiple numerical value, operating process and processing number
According to complexity.The principle of electric traction method is to make its uniform rotation by adjusting motor to measure frictional force, such as Patent No.
2008100204889 Chinese patent discloses a kind of " plane, slope kinematics and static friction power demonstrator ", can demonstrate plane with
The size and Orientation of kinematics and static friction power, maximum static friction force and force of sliding friction in slope, structure is simple, and operation demonstration is convenient；
The disadvantage is that adjusting, motor speed is at the uniform velocity more difficult, reading is inconvenient and error is larger, cannot demonstrate out frictional force direction and
Relative motion trend direction intuitively cannot accurately demonstrate the variation of stiction, maximum static friction force to force of sliding friction
Journey can not demonstrate force of rolling friction, and experimental data need manually to calculate by the later period can just obtain experiment knot
Fruit, larger workload, demonstrating effect are poor.
Summary of the invention
Present invention seek to address that the above problem, provides a kind of frictional force experimental demonstration device, intuitive and accurate can demonstrate out
The change procedure of stiction, maximum static friction force to force of sliding friction, moreover it is possible to which force of rolling friction is demonstrated.
Frictional force experimental demonstration device of the invention, comprising: pedestal, experimental bench, friction block, tension sensor, motor drive
Dynamic device, wire reels, control device, display screen, image collecting device；
The pedestal is equipped with column, and the column top is welded with hinged block, the pedestal and experimental bench described in
Hinged block is hinged；The experimental bench is equipped with scale, and the displacement information of friction block can directly display out on experimental bench, tests
One side surface of platform top has pressure and claims, and the friction block starting is placed in pressure and deserves to be called, between the pedestal and experimental bench also
Equipped with the elevation and subsidence regulating device for adjusting the experimental bench gradient；
The friction block is identical as four adjacent surface areas of cord joint face, wherein three surfaces have it is different thick
Four angles of rugosity, another surface are equipped with idler wheel, and the surface opposite with cord joint face is smaller than the area on aforementioned four surfaces,
The relationship of frictional force and different affecting factors can be investigated by replacing different surfaces；The friction block is equipped with described in driving and rubs
Cleaning block is back to the third motor of initial position；
Described tension sensor one end is connect by cord with friction block, the other end is connect by cord with wire reels；Even
It is parallel with the experimental bench to connect the friction block, tension sensor, the cord of wire reels；
The motor driver includes first motor, driving gear, driven gear, shaft；The first motor driving
Driving gear rotation, so that driven gear be driven to rotate, the wire reels are connect by shaft with driven gear；
The experimental bench is equipped with sliding rail, and described image acquisition device can move on the sliding rail, described image acquisition dress
It sets including camera and support rod, the camera is fixed on the support rod, and the support rod, which is equipped with, drives the figure
As the second mobile motor of acquisition device；
The control device and display screen are set on the pedestal, and the control device includes integrated circuit board, is plugged in
Single-chip microcontroller, wireless messages transmitter, wireless messages receiver and USB interface on integrated circuit board；The pressure claims, pulling force passes
Sensor, first motor, the second motor, third motor, image collecting device are connect with the control device, and the control device will
The pressure claims, tension sensor, the information of the acquired image of camera are issued by wireless messages transmitter, then passes through nothing
Line message recipient receives signal and shows on the display screen；The display screen shows weight, the frictional force, friction of friction block
Coefficient data and camera institute acquired image.
Control device issues the value for the frictional force handled well by wireless messages transmitter, passes through wireless messages receiver
Signal is received, is then shown by display screen, the data that display screen is shown are exactly the friction force value of measured object.
Computer is connected by the USB interface of the control device, or reconnects projection device, described image is acquired and is filled
The information and frictional experiment data projection for setting acquisition shows, classmates can easily observation experiment, deepen to frictional force
The understanding of knowledge point.
Further, the device of the invention further includes ultrasonic sensor, at friction block, tension sensor, wire reels
In on same straight line, the ultrasonic sensor is connect with the control device, for obtaining friction block position.
Further, the control device uses PID control, and PID control is a kind of linear control method, industrially
Using very extensive, it is easily understood, the prerequisites such as accurate system model is not required in use；It is by given value and reality output
The ratio of the deviation of value, integral and differential carry out linear combination, form control amount output, accurately control friction block and do and mutually meet the tendency of
It is dynamic, obtain accurate experimental result.
Further, the lifting device includes telescopic rod and height adjustment knob and/or the friction block is cuboid
Shape, four surface shapes adjacent with cord joint face are rectangle, and the surface shape opposite with cord joint face is pros
Shape, to investigate the relationship between frictional force and contact area.
Further, the control device be equipped with control button, the control button include power knob, at the uniform velocity by
Button, selector button, reset button, the power knob is used to control the unlatching and stopping of the control device, described at the uniform velocity to press
Button is for adjusting the speed that the first motor pulls the friction block uniform motion, and the selector button is for adjusting described the
One motor pulls the speed of the friction block variable motion, and friction block described in the reset button control third motor driven returns
It is back to initial position to initial position and the second motor driven image collecting device of control, teacher can say to classmates at this time
Experimental phenomena is solved, with classmates' exchange and interdynamic, saves the time, simplifies experimental implementation, it is very convenient.
Further, Xiang Suoshu control device input at the uniform velocity algorithmic formula or speed change algorithmic formula control friction block are at the uniform velocity transported
Dynamic or variable motion；The speed change algorithmic formula includes PWM speed change algorithmic formula, accelerating algorithm formula, in deceleration algorithmic formula
It is one or more.
Further, article putting groove is equipped in the friction block, the quality of friction block can change by outer weighting material.
Further, the article putting groove is magnetic article putting groove, by the magnetic force between weight and article putting groove by the position of weight
Fixation is set, to guarantee the accuracy of experimental result；
And/or the sliding rail section is in T font structure, the bottom end of the support rod has to match with the sliding rail
Limited block.
Further, the friction block three surfacings adjacent with cord joint face are respectively as follows: timber, iron, rubber,
Wherein rubber face is rubber hairbrush, and direction shown by the rubber hairbrush, is the direction of the friction block friction,
The friction block surfacing opposite with cord joint face is timber.
Further, the first motor, and/or the second motor are slowspeed machine, slowspeed machine bring motion excursion
Amount is smaller, guarantees friction block by the movement that imposes a condition.
What the present invention obtained has the beneficial effect that:
1, friction block four sides has different roughness, and different coefficients of friction surface can be investigated by not needing replacement friction block
The influence of friction when moving to friction block or have relative motion trend can measure maximum static friction force simultaneously, sliding rubs
Power and force of rolling friction are wiped, frictional force when friction block moves on the slope can be also investigated；
2, position and the displacement information for being obtained friction block in real time using ultrasonic sensor, are sent to control device and passed through
Pid control algorithm adjusts motor speed, moves it in strict accordance with the moving condition of setting, accurately measures friction described in friction block
Power；
3, friction block and image collecting device can automatically return to initial position after experiment every time, simplify experimental implementation
The time is saved, while can also cause classmates to the interest of experiment, deepens the understanding to knowledge point；
4, the present invention is equipped with image collecting device, can show in face of classmates the concrete condition of experimentation, attract
The interest of classmates, sharpens understanding；Friction block is equipped with rubber hairbrush, can intuitively show the direction of friction block friction, leads to
Crossing image collecting device also can be projected on screen；
5, the setting of article putting groove can increase positive pressure of the magnetic weight to increase friction block to experimental bench in friction block
Power, and increased magnetic weight will not move in article putting groove, avoid the influence of other external force, ensure that experiment knot
The accuracy of fruit.
6, the device of the invention structure is simpler, easy to operate, and experimental result is accurate and visual.
Detailed description of the invention
Fig. 1 is frictional force experimental demonstration device front view of the invention；
Fig. 2 is frictional force experimental demonstration device experimentation schematic diagram of the invention；
Fig. 3 is controling device structure diagram of the invention；
Fig. 4 is image collecting device of the invention, sliding rail and lifting device structure schematic diagram；
Fig. 5 is that frictional force experimental demonstration device control section of the invention is electrically connected schematic diagram；
Fig. 6 is frictional force experimental demonstration device operation principle schematic diagram of the invention；
Each appended drawing reference in figure: pedestal 1, experimental bench 2, friction block 3, tension sensor 4, motor driver 5, wire reels
6, control device 7, display screen 8, image collecting device 9, cord 10, lifting device 11, ultrasonic sensor 12, column 101, hinge
Connecing block 102, pressure claims 201, scale 202, sliding rail 203, idler wheel 301, article putting groove 302, rubber hairbrush 303, third motor 304,
First motor 501, driving gear 502, driven gear 503, shaft 504, integrated circuit board 701, single-chip microcontroller 702, wireless messages
Transmitter 703, wireless messages receiver 704, USB interface 705, power knob 706, at the uniform velocity button 707, selector button 708, again
Set button 709, camera 901, support rod 902, the second motor 903, limited block 904.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear
Chu is fully described by, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts all
Other embodiments shall fall within the protection scope of the present invention.
Embodiment 1:
The frictional force experimental demonstration device of the present embodiment, as shown in figs. 1 to 6, comprising: pedestal 1, experimental bench 2, friction block 3,
Tension sensor 4, motor driver 5, wire reels 6, control device 7, display screen 8, image collecting device 9.
Wherein, pedestal 1 is equipped with column 101, and 101 top of column is welded with hinged block 102, and pedestal 1 passes through with experimental bench 2
Hinged block 102 is hinged；Experimental bench 2 is equipped with scale 202, and one side surface of top has pressure and claims 201, and friction block 3 originates
Pressure is placed in claim on 201；Elevation and subsidence regulating device 11 is additionally provided between pedestal 1 and experimental bench 2, including telescopic rod 1101 and height are adjusted
Knob 1102 is saved, for adjusting 2 gradient of experimental bench；
Friction block 3 is rectangular shape, and four surface shapes adjacent with 10 joint face of cord are rectangle and area phase
Together, wherein three surfaces have different roughness, material is respectively as follows: timber, iron, rubber, and wherein rubber face is rubber hair
303 are brushed, direction shown by rubber hairbrush 303, is the direction of 3 friction of friction block in experiment, another surface
Four angles are equipped with idler wheel 301, can be used for the frictional force being subject to when testing friction block 3 rolls；Friction block 3 and 10 joint face phase of cord
Pair surfacing be that timber and shape are square, the area on aforementioned four surfaces of area ratio is small；It is additionally provided with inside friction block 3
The quality of article putting groove 302, friction block 3 can be changed by outer weighting material；Friction block 3 is equipped with driving friction block 3 and has been back to
The third motor 304 (model ZWMD008008-152-01) of beginning position；
The one end tension sensor 4 (model VS16) is connect by cord 10 with friction block 3, the other end passes through cord 10 and disk
Line wheel 6 connects；It is parallel with experimental bench 2 to connect friction block 3, tension sensor 4, the cord 10 of wire reels 6；
Motor driver 5 includes first motor 501 (model ZWMD008008-152-01), driving gear 502, driven
Gear 503, shaft 504；First motor 501 drives driving gear 502 to rotate, so that driven gear 503 is driven to rotate, wire reels
6 are connect by shaft 504 with driven gear 503；
Experimental bench 2 is equipped with the sliding rail 203 in T font structure, and image collecting device 9 includes camera 901 and support rod
902, camera 901 is fixed on support rod 902, and support rod 902 is equipped with 903 (model ZWMD008008-152- of the second motor
01), the bottom end of support rod 902 has the limited block 904 to match with sliding rail 203, passes through the driving and cunning of the second motor 903
The cooperation of rail 203 and limited block 904, image collecting device 9 can move on sliding rail 203；
Control device 7 and display screen 8 are set on pedestal 1, and control device 7 includes integrated circuit board 701, is plugged in integrated electricity
Single-chip microcontroller 702 (model AT89C51), wireless messages transmitter 703, wireless messages receiver 704 and USB on road plate 701 connect
Mouth 705, single-chip microcontroller use pid control algorithm；The integrated circuit board 701 of control device 7 is equipped with control button, including power supply is pressed
Button 706, at the uniform velocity button 707, selector button 708, reset button 709, power knob 706 is used to open and stop control 7,
At the uniform velocity for adjusting the speed that first motor 501 pulls the friction block 3 to move with uniform velocity, selector button 708 is used for button 707
The speed that 501 drawing friction block 3 of first motor does variable motion is adjusted, reset button 709 controls the driving friction of third motor 304
Block 3 is back to initial position and control the second motor 903 driving image collecting device 9 is back to initial position.
Pressure claim 201, tension sensor 4, first motor 501, the second motor 903, third motor 304, camera 901 with
Control device 7 connects, the pulling force that pressure is claimed 201 obtained friction block weight datas, tension sensor 4 to obtain by control device 7
Data, the information of the acquired image of camera 901 are issued by wireless messages transmitter 703, are then received by wireless messages
Device 704 receives signal and shows on display screen 8.The data that display screen 8 is shown include: the weight, frictional force, friction system of friction block
Number data and camera institute acquired image.
By USB interface 705 connect computer, or reconnect projection device, the information that image collecting device 9 is acquired with
And frictional experiment data projection is shown, classmates can easily observation experiment, deepen the understanding to frictional force knowledge point.
Embodiment 2:
As shown in figs. 1 to 6, on the basis of embodiment 1, motor used in the device of the present embodiment is low speed electricity
Machine, bring shift offset is small during exercise, is relatively easy to control.
Embodiment 3:
As shown in figs. 1 to 6, the device of the present embodiment, on the basis of embodiment 2, close to wire reels 6 on experimental bench 2
Position is equipped with ultrasonic sensor 12 (model TCRT16-40), is in same with friction block 3, tension sensor 4, wire reels 6
On straight line；By the real time position of the available friction block 3 of ultrasonic sensor 12, so that the movement velocity of friction block 3 is obtained,
And control device 7 is transferred the signal to the, control device 7 issues instruction to first motor 501 by pid algorithm and adjusts motor turn
Speed, the tractive force that motor is provided allow friction block 3 to move by the moving condition of setting, and tension sensor 4 senses first
The tractive force of motor calculates value of thrust by control device 7, according to Newton's third law it is found that the tractive force is to rub
3 friction of block.
Embodiment 4:
As shown in figs. 1 to 6, the device of the present embodiment, on the basis of embodiment 3, article putting groove 302 is magnetic article putting groove,
The position of weight is fixed by the magnetic force between weight and article putting groove 302, increased magnetism weight will not be sent out in article putting groove
Raw movement, avoids the influence of other external force.
Embodiment 5:
Using the device of embodiment 4 as research object, frictional force experimental demonstration is carried out.
Experiment 1: demonstration stiction direction of relative movement, the force of sliding friction direction of motion
By be placed on experimental bench 2 on one side with rubber hairbrush 302 of friction block 3, pressure claims the weight of 201 weighing friction blocks 3
Amount, then presses power knob 706 and at the uniform velocity button 707, and first motor 501 drives friction block 3 to do relative motion with experimental bench 2
Trend or relative motion, the second motor 903 drive image collecting device 9 to move synchronously with friction block, pass through display screen 8 and USB
The hairbrush direction of the external computer of interface 705 and projection device observation rubber hairbrush 302, so that it is determined that friction block 3 and experimental bench 2
The direction for the trend that does relative motion and the direction of relative motion.
Pressing reset button 709 after the completion of experiment every time makes 9 correcting action of friction block 3 and image collecting device.This
When teacher can explain experimental phenomena to classmates, with classmates' exchange and interdynamic.
Experiment 2: stiction, maximum static friction force, force of sliding friction and force of rolling friction on measurement horizontal plane
By be placed on experimental bench 2 on one side with rubber hairbrush 302 of friction block 3, pressure claims the weight of 201 weighing friction blocks 3
Amount, then presses power knob 706 and at the uniform velocity button 707, is driven by first motor 501 and is done relative motion with experimental bench 2, by
Pid control algorithm is precisely controlled motor pulling force size, and the data that tension sensor 4 measures are accurate frictional force.With experiment 1
Similar, experimental phenomena again may be by image collecting device 9 and carry out real time demonstration, so as to intuitively observe very much quiet rub
Wipe power, maximum static friction force, force of sliding friction.
It can be found through observation, stiction changes with external force, when external force increases to a certain degree, that is, reaches most
Big stiction, friction block setting in motion, is at this time force of sliding friction later, and maximum static friction force is slightly larger than sliding friction
Power.
By be placed on experimental bench 2 on one side equipped with idler wheel 301 of friction block 3, other steps are same as above, and can demonstrate rolling friction
Power.
Pressing reset button 709 after the completion of experiment every time makes 9 correcting action of friction block 3 and image collecting device.Together
Sample, teacher can explain experimental phenomena to classmates at this time, with classmates' exchange and interdynamic.
Experiment 3: stiction, maximum static friction force and force of sliding friction on inclined-plane are investigated
By being placed on experimental bench 2 on one side for 3 wood surface of friction block, pressure claims the weight of 201 weighing friction blocks 3, then
Experimental bench 2 is adjusted by lifting device 11 and pedestal 1 is angled, other steps are the same as experiment 2.
Experiment 4: research influences the factor of stiction, maximum static friction force and force of sliding friction
(1) it is placed on experimental bench 2 with the timber of friction block 3, steel, rubber hairbrush surface, demonstration friction and contact surface
The relationship of friction material, the change procedure of observation stiction, maximum static friction force to force of sliding friction.
(2) it is contacted with wood surface with experimental bench 2, is put into magnetic weight into the article putting groove 302 of friction block 2 and is rubbed with changing
The weight of cleaning block 3, the change procedure of observation stiction, maximum static friction force to force of sliding friction.
(3) it is contacted, i.e. change contact area, is observed quiet with experimental bench 2 with the friction block surface opposite with cord joint face
The change procedure of frictional force, maximum static friction force to force of sliding friction.
(4) it is contacted with wood surface with experimental bench 2, presses selector button 708, input PWM speed change algorithm to control device 7
Formula accelerates friction block 3, the change procedure of observation stiction, maximum static friction force to force of sliding friction.
The experimental data of experiment 1~4 is listed in table 1.
Table 1
By experimental data in table 1 it is found that normal pressure (4 (1) timber of experiment and the experiment 4 of object friction and object
(2)), contact surface degree of roughness experiment (4 (1) timber, steel, rubber hairbrush) is related, with speed of moving body (4 (1) of experiment wood
4 (4) of material and experiment), contact area (4 (3) of 4 (1) timber of experiment and experiment) is unrelated between object；Coefficient of friction between contact surface
Normal pressure (4 (1) timber of experiment and experiment 3), speed of moving body (4 (4) of 4 (1) timber of experiment and experiment), object with object
Between contact area (experiment 4 (1) timber and experiment 4 (3)) it is unrelated.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features,
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (10)
1. a kind of frictional force experimental demonstration device characterized by comprising pedestal, experimental bench, friction block, tension sensor, electricity
Machine actuating device, wire reels, control device, display screen, image collecting device；
The pedestal is equipped with column, and the column top is welded with hinged block, and the pedestal and experimental bench pass through described hinged
Block is hinged；The experimental bench is equipped with scale, and one side surface of top has pressure and claims, and the friction block starting is placed in pressure
It deserves to be called, the elevation and subsidence regulating device for adjusting the experimental bench gradient is additionally provided between the pedestal and experimental bench；
The friction block is identical as four adjacent surface areas of cord joint face, wherein three surfaces have it is different coarse
Four angles of degree, another surface are equipped with idler wheel, and the surface opposite with cord joint face is smaller than the area on aforementioned four surfaces；Institute
It states friction block and is equipped with the third motor for driving the friction block to be back to initial position；
Described tension sensor one end is connect by cord with friction block, the other end is connect by cord with wire reels；Connection institute
It is parallel with the experimental bench to state friction block, tension sensor, the cord of wire reels；
The motor driver includes first motor, driving gear, driven gear, shaft；The first motor driving is actively
Gear rotation, so that driven gear be driven to rotate, the wire reels are connect by shaft with driven gear；
The experimental bench is equipped with sliding rail, and described image acquisition device can move on the sliding rail, described image acquisition device packet
Camera and support rod are included, the camera is fixed on the support rod, and the support rod is equipped with driving described image and adopts
The second mobile motor of acquisition means；
The control device and display screen are set on the pedestal, the control device include integrated circuit board, be plugged in it is integrated
Single-chip microcontroller, wireless messages transmitter, wireless messages receiver and USB interface on circuit board；The pressure claims, pull sensing
Device, first motor, the second motor, third motor, image collecting device are connect with the control device, and the control device is by institute
State that pressure claims, tension sensor, the information of the acquired image of camera are issued by wireless messages transmitter, then by wireless
Message recipient receives signal and shows on the display screen；The display screen shows the weight, frictional force, friction system of friction block
Number data and camera institute acquired image.
2. frictional force experimental demonstration device as described in claim 1, which is characterized in that further include ultrasonic sensor, with institute
Control device connection is stated, for obtaining friction block position.
3. frictional force experimental demonstration device as described in claim 1, which is characterized in that the control device uses PID control.
4. frictional force experimental demonstration device as described in claim 1, which is characterized in that the lifting device include telescopic rod with
Height adjustment knob and/or the friction block are rectangular shape, and four surface shapes adjacent with cord joint face are rectangular
Shape, the surface shape opposite with cord joint face are square.
5. frictional force experimental demonstration device as described in claim 1, which is characterized in that the control device is equipped with control and presses
Button, the control button include power knob, at the uniform velocity button, selector button, reset button, and the power knob is for controlling institute
The unlatching and stopping of control device are stated, the at the uniform velocity button pulls the friction block uniform motion for adjusting the first motor
Speed, the selector button is for adjusting the speed that the first motor pulls the friction block variable motion, the resetting
Friction block described in button control third motor driven is back to initial position.
6. frictional force experimental demonstration device as claimed in claim 5, which is characterized in that the input of Xiang Suoshu control device is at the uniform velocity calculated
Method formula or speed change algorithmic formula control friction block uniform motion or variable motion；The speed change algorithmic formula includes PWM speed change
One of algorithmic formula, accelerating algorithm formula, deceleration algorithmic formula are a variety of.
7. frictional force experimental demonstration device as described in claim 1, which is characterized in that be equipped with article putting groove in the friction block.
8. the frictional force experimental demonstration device as described in any one of claims 1 to 7, which is characterized in that the article putting groove is
Magnetic article putting groove；And/or the sliding rail section is in T font structure, the bottom end of the support rod has to match with the sliding rail
Limited block.
9. frictional force experimental demonstration device as claimed in claim 8, which is characterized in that the friction block and cord joint face phase
Three adjacent surfacings are respectively as follows: timber, iron, rubber, and wherein rubber face is rubber hairbrush, and the friction block is connect with cord
The opposite surfacing in face is timber.
10. frictional force experimental demonstration device as claimed in claim 9, which is characterized in that the first motor, and/or second
Motor is slowspeed machine.
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| CN110619768A (en) * | 2019-09-20 | 2019-12-27 | 铜仁职业技术学院 | A multimode english teaching device for english teaching |
| CN111337423A (en) * | 2020-02-25 | 2020-06-26 | 中国石油天然气股份有限公司 | Method and device for measuring friction characteristic of proppant |
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| CN111337423A (en) * | 2020-02-25 | 2020-06-26 | 中国石油天然气股份有限公司 | Method and device for measuring friction characteristic of proppant |
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