CN110942701A - Experimental apparatus is measured to primary school's science buoyancy - Google Patents
Experimental apparatus is measured to primary school's science buoyancy Download PDFInfo
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- CN110942701A CN110942701A CN201911318976.2A CN201911318976A CN110942701A CN 110942701 A CN110942701 A CN 110942701A CN 201911318976 A CN201911318976 A CN 201911318976A CN 110942701 A CN110942701 A CN 110942701A
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Abstract
The invention provides a scientific buoyancy measurement experimental device for primary schools. The experimental device for measuring the scientific buoyancy of the primary school comprises an equal-arm lever ruler; the two hard iron wires are symmetrically arranged on the equal-arm lever ruler, and the top ends of the hard iron wires are connected with the equal-arm lever ruler; the two plastic bottles are respectively arranged at the bottom ends of the two hard iron wires; the spring dynamometer is installed on the equal-arm lever ruler and is matched with the corresponding plastic bottle; the overflow cup is arranged on the outer side of the corresponding plastic bottle; and the dial is arranged on the equal-arm lever ruler 1. The experimental device for measuring the scientific buoyancy of the primary school provided by the invention has the advantages of convenience in use, simplicity in operation, easiness in understanding of principle and capability of directly measuring the size of the buoyancy.
Description
Technical Field
The invention relates to the technical field of experimental devices, in particular to a primary school scientific buoyancy measurement experimental device.
Background
The existing experiment for measuring the buoyancy of the teaching material for primary schools is as follows: .
Experimental design for measuring buoyancy of textbook
1. Experimental equipment: transparent glass water vat, plasticine, foamed plastic, thin thread rope, small pulley, spring dynamometer, water.
2. The experimental process comprises the following steps:
1) the weight force to which the foam bun was subjected was measured prior to placing in water.
2) The foam block is pulled by a wire into the water to a certain position (a small portion into the water) and the value of the tension on the spring dynamometer is read.
3) The tensile force is added with the gravity borne by the foam plastic block, namely the buoyancy borne by the foam plastic block in water.
4) And respectively putting most of the foamed plastic into water and putting all the foamed plastic into the water, repeating the steps, measuring, and filling the measured values into the following table.
The buoyancy of the foam block in water is recorded (dead weight: Newton):
| a small part enters water | Most of the water enters into the water | All enter water | |
| Magnitude of pulling force | |||
| Magnitude of buoyancy | |||
| Amount of drained water |
3. And (4) experimental conclusion: the volume () of the drained water, the buoyancy force to which the object is subjected.
I consider the following deficiencies with respect to the above experimental design:
1. in the process of measuring the buoyancy, the pulling force is increased, the direction of the pulling force is downward, the gravity exists, the quantity of the force is a little more, the direction of the force is represented by an arrow, the force is abstract for primary school students, certain interference is caused to the understanding of the buoyancy by the students, and the difficulty of learning is increased invisibly.
2. Because the water container is too large, the rising height of the water surface is not large after the foam plastic enters the water, and the amount of the discharged water is not known, namely the experimental phenomenon is not obvious. Students do not observe the amount of water drained from the experiment, but deduce the amount of water entering the experiment according to the amount of objects, which is contrary to the cognitive rule of the students. Scientific experiments should be a cognitive process from experimental phenomena to essentials, rather than from conjecture to essentials.
3. The measurement result has no concise quantitative relation between the tension and the buoyancy, and no direct help is provided for the conclusion of the experiment.
4. The small pulley is bonded to the bottom of the container by the plasticine in water, and the plasticine is easy to fall off, so that the experiment is interrupted and even fails.
Therefore, it is necessary to provide a new experimental apparatus for scientific buoyancy measurement in primary schools to solve the above technical problems.
Disclosure of Invention
The invention solves the technical problem of providing a primary school scientific buoyancy measurement experimental device which is convenient to use, simple to operate, easy to understand the principle and capable of directly measuring the magnitude of the buoyancy.
In order to solve the technical problem, the experimental device for measuring the scientific buoyancy of the primary school provided by the invention comprises: an equal arm lever ruler; the two hard iron wires are symmetrically arranged on the equal-arm lever ruler, and the top ends of the hard iron wires are connected with the equal-arm lever ruler; the two plastic bottles are respectively arranged at the bottom ends of the two hard iron wires; the spring dynamometer is installed on the equal-arm lever ruler and is matched with the corresponding plastic bottle; the overflow cup is arranged on the outer side of the corresponding plastic bottle; a dial mounted on the equal arm lever ruler; the pointer is arranged on the equal-arm lever ruler and is matched with the dial; the measuring cup is positioned on one side of the overflow cup and is matched with the overflow cup.
Preferably, wait arm lever chi includes the base, the top fixed mounting of base has the sleeve pipe, sliding mounting has the regulation pole in the sleeve pipe, it installs lever chi to rotate on the regulation pole, the equal fixed mounting in both ends of lever chi has adjusting screw, the last balanced nut that is equipped with of adjusting screw, the top fixed mounting who adjusts the pole has the connecting rod, the dead lever is installed to the bottom of connecting rod.
Preferably, the top of the fixing rod is fixedly connected with the bottom of the connecting rod.
Preferably, a mounting hole is formed in one side of the adjusting rod, the lever ruler penetrates through the mounting hole and is rotatably mounted in the mounting hole, the adjusting rod is fixedly mounted in a rotating shaft, the rotating shaft is rotatably connected with the inner walls of the two sides of the mounting hole, one end of the rotating shaft extends to the outer side of the adjusting rod and is fixedly connected with the pointer, and the dial is fixedly connected with the sleeve.
Preferably, the inner walls of the two sides of the sleeve are provided with limit grooves, the two sides of the adjusting rod are fixedly provided with limit blocks, and the limit blocks are in sliding connection with the corresponding inner walls of the limit grooves.
Preferably, one side of the sleeve is fixedly provided with a limiting shell, the sleeve is provided with a brake rod in a threaded manner, one end of the brake rod is in contact with the adjusting rod, and the other end of the brake rod penetrates through the limiting shell and is fixedly provided with a lifting handle.
Preferably, the limiting shell is provided with a through hole, and the brake rod penetrates through the through hole.
Preferably, a brake block fixedly sleeved on the outer side of the brake rod is arranged in the limiting shell, and the brake block is matched with the through hole.
Preferably, the fixing rod penetrates through the connecting rod and is in sliding connection with the connecting rod, and a butterfly-shaped zero adjusting nut located above the connecting rod is sleeved on the outer side of the fixing rod in a threaded manner.
Preferably, the sliding grooves are formed in the two sides of the fixing rod, the sliding blocks fixedly connected with the connecting rods are arranged on the two sides of the fixing rod, and the sliding blocks are connected with the corresponding inner walls of the sliding grooves in a sliding mode.
Compared with the related technology, the experimental device for measuring the scientific buoyancy of the primary school provided by the invention has the following beneficial effects:
1. the irrelevant factor of gravity is reduced, the buoyancy can be directly measured, and the difficulty of understanding the experimental principle by students is reduced;
2. the object to be measured is selected as an empty plastic bottle, the empty bottle can measure the buoyancy of the floating object, and the two bottles can be used as sinking objects to measure the buoyancy of the sinking objects after being filled with equal amount of sand;
3. compared with the textbook experimental device, the improved experimental device is convenient for students to operate, reduces the operation difficulty, and meanwhile, as the lifting handle is arranged, the students can conveniently measure the buoyancy of a small part of objects in water, a large part of objects in water and all objects in water;
4. the water container is replaced by the overflow cup, the measuring cup is used for accommodating the overflow water container, the overflow amount can be accurately read through the measuring cup, the amount of water drained by an object can be known at a glance, and the experimental phenomenon is obvious.
Drawings
FIG. 1 is a schematic view of a first embodiment of a buoyancy measurement experimental device for primary school science according to the present invention;
FIG. 2 is a schematic cross-sectional view of the structure shown in FIG. 1;
FIG. 3 is a schematic structural view of the isochoric lever ruler shown in FIG. 1;
FIG. 4 is an enlarged view of portion A of FIG. 3;
FIG. 5 is a schematic view of a second embodiment of the experimental apparatus for measuring buoyancy of science in primary school provided by the present invention;
FIG. 6 is a schematic view of a third embodiment of the experimental apparatus for measuring buoyancy of science in primary school provided by the present invention;
fig. 7 is an enlarged view of the portion B shown in fig. 6.
Reference numbers in the figures: 1. the device comprises an equal-arm lever ruler 101, a base 102, a sleeve 103, an adjusting rod 104, a lever ruler 105, an adjusting screw 106, a balance nut 107, a connecting rod 108, a fixing rod 109, a mounting hole 110, a limiting shell 111, a brake rod 112, a brake block 113, a lifting handle 114, a butterfly-shaped zero-setting nut 115, a sliding block 2, a hard iron wire 3, a plastic bottle 4, a spring dynamometer 5, a spill cup 6, a dial 7, a measuring cup 8 and a pointer.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
The first embodiment:
referring to fig. 1-4, in a first embodiment of the present invention, an experimental apparatus for measuring buoyancy of a scientific primary school includes: an equal arm lever ruler 1; the two hard iron wires 2 are symmetrically arranged on the equal-arm lever ruler 1, and the top ends of the hard iron wires 2 are connected with the equal-arm lever ruler 1; the two plastic bottles 3 are respectively arranged at the bottom ends of the two hard iron wires 2; the spring dynamometer 4 is installed on the equal-arm lever ruler 1, and the spring dynamometer 4 is matched with the corresponding plastic bottle 3; the overflow cup 5 is arranged on the outer side of the corresponding plastic bottle 3; a dial 6, the dial 6 being mounted on the equal arm lever ruler 1; the pointer 8 is installed on the equal-arm lever ruler 1, and the pointer 8 is matched with the dial 6; the measuring cup 7 is positioned on one side of the overflow cup 5, and the measuring cup 7 is matched with the overflow cup 5.
Arm-waiting lever chi 1 includes base 101, the top fixed mounting of base 101 has sleeve pipe 102, slidable mounting has regulation pole 103 in the sleeve pipe 102, it installs lever chi 104 to rotate on the regulation pole 103, the equal fixed mounting in both ends of lever chi 104 has adjusting screw 105, the last balance nut 106 that is equipped with of adjusting screw 105, the top fixed mounting of adjusting pole 103 has connecting rod 107, dead lever 108 is installed to the bottom of connecting rod 107.
The top of the fixing rod 108 is fixedly connected with the bottom of the connecting rod 107.
The utility model discloses a pointer 8, including adjusting pole 103, mounting hole 109 has been seted up to one side of adjusting pole 103, lever ruler 104 runs through mounting hole 109 and rotate the installation in the mounting hole 109, fixed mounting is in the pivot on the adjusting pole 103, the pivot with the both sides inner wall of mounting hole 109 rotates and is connected, the one end of pivot extend to adjust the outside of pole 103 and with pointer 8 fixed connection, calibrated scale 6 with sleeve pipe 102 fixed connection.
Limiting grooves are formed in the inner walls of the two sides of the sleeve 102, limiting blocks are fixedly mounted on the two sides of the adjusting rod 103, and the limiting blocks are connected with the inner walls of the corresponding limiting grooves in a sliding mode.
A limiting shell 110 is fixedly installed at one side of the sleeve 102, a brake lever 111 is installed on the sleeve 102 in a threaded manner, one end of the brake lever 111 is in contact with the adjusting rod 103, and the other end of the brake lever 111 penetrates through the limiting shell 110 and is fixedly installed with a lifting handle 113.
The limiting shell 110 is provided with a through hole, and the brake rod 111 penetrates through the through hole.
A brake block 112 fixedly sleeved on the outer side of the brake rod 111 is arranged in the limiting shell 110, and the brake block 112 is matched with the through hole.
The working principle of the experimental device for measuring the scientific buoyancy of the primary school provided by the invention is as follows:
firstly, putting the equal-arm lever ruler 1 on a horizontal desktop, adjusting a left balance nut 106 and a right balance nut 106 to balance the lever ruler 104 in the horizontal position, enabling the pointer 8 to vertically downwards face the zero scale of the dial 6, and adjusting a lifting handle 113 to enable the lever ruler 104 to be highest in height;
secondly, hanging two identical plastic bottles 3 connected by hard iron wires 2 at the positions of the left end and the right end of the lever ruler 104 which are equal to the center of the ruler respectively;
thirdly, a graduated measuring cup is arranged under the overflow pipe mouth of the overflow cup 5, so that the installation and debugging work of the whole experimental device is completed;
the fourth step, rotate lift handle 113, promote the regulation pole 103 downwards, make left side plastic bottle 3 downstream and go into the aquatic of overflow glass 5, this process, during the extrusion that the left side plastic bottle 3 was received to the water in overflow glass 5 flows into measuring glass 7 through the overflow pipe, the volume of water in measuring glass 7 is exactly the volume that left side plastic bottle 3 immerged in the aquatic, the reading on the spring dynamometer 4 and the buoyancy that left side plastic bottle 3 received this moment equals, promptly: f, the pulling force is equal to F buoyancy, and the derivation process is as follows:
F1×L1＝F2×L2；
L1＝L2；
F1＝F2；
f buoyancy-G is equal to F tension-G;
f buoyancy is F tensile force;
f, the tensile force is F buoyancy;
the reading on the spring load cell 4 is therefore the buoyancy to which the left plastic bottle 3 is subjected.
Compared with the related technology, the experimental device for measuring the scientific buoyancy of the primary school provided by the invention has the following beneficial effects:
1. the irrelevant factor of gravity is reduced, the buoyancy can be directly measured, and the difficulty of understanding the experimental principle by students is reduced;
2. the measured object is selected as an empty plastic bottle, the empty bottle can be used as a floating object to measure the buoyancy of the floating object, and after the two bottles are filled with equal amount of sand, the empty bottle can be used as a sinking object to measure the buoyancy of the sinking object;
3. compared with the textbook experimental device, the improved experimental device is convenient for students to operate, reduces the operation difficulty, and meanwhile, as the lifting handle 113 is arranged, the students can conveniently measure the buoyancy of a small part of objects in water, a large part of objects in water and all objects in water;
4. the water container is replaced by the overflow cup 5, the measuring cup 7 is used for accommodating the overflow water container, the overflow amount can be accurately read through the measuring cup 7, the amount of water drained by an object can be known at a glance, and the experimental phenomenon is obvious.
Second embodiment:
based on the experimental apparatus for measuring the scientific buoyancy of the primary school provided by the first embodiment of the application, the second embodiment of the application provides another experimental apparatus for measuring the scientific buoyancy of the primary school. The second embodiment is merely a preferred way of the first embodiment, and the implementation of the second embodiment does not affect the implementation of the first embodiment alone.
The second embodiment of the present invention will be further described with reference to the drawings and the following description.
Referring to fig. 5, another equal arm lever ruler 1 is arranged on one side of the experimental apparatus for measuring scientific buoyancy of primary school in the first embodiment, the measuring cup 7 in the first embodiment is hung on the other equal arm lever ruler 1, and the measuring cup 7 identical to the measuring cup 7 in the first embodiment is additionally arranged on the other equal arm lever ruler 1, so that it can be observed that the readings of the two spring load cells 4 are identical, and knowledge expansion can be performed on the basis of previous knowledge learning or the experimental apparatus can be used for physical buoyancy experiments in the first middle school.
The third embodiment:
referring to fig. 6 and 7, the difference between the present embodiment and the first embodiment is that the fixing rod 108 penetrates through the connecting rod 107 and is slidably connected to the connecting rod 107, and a butterfly zero-setting nut 114 located above the connecting rod 107 is threaded on the outer side of the fixing rod 108.
The fixing rod 108 is provided with sliding grooves on two sides, the fixing rod 108 is provided with sliding blocks 115 fixedly connected with the connecting rod 107 on two sides, and the sliding blocks 115 are connected with the corresponding sliding grooves in a sliding manner
After the spring load cell 4 is mounted, the height of the fixing rod 108 can be adjusted by rotating the butterfly zero nut 114, so that the spring load cell 4 can be zeroed before use, and the measurement of the spring load cell 4 can be more accurate.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides an experimental apparatus is measured to primary school's science buoyancy which characterized in that includes:
an equal arm lever ruler;
the two hard iron wires are symmetrically arranged on the equal-arm lever ruler, and the top ends of the hard iron wires are connected with the equal-arm lever ruler;
the two plastic bottles are respectively arranged at the bottom ends of the two hard iron wires;
the spring dynamometer is installed on the equal-arm lever ruler and is matched with the corresponding plastic bottle;
the overflow cup is arranged on the outer side of the corresponding plastic bottle;
a dial mounted on the equal arm lever ruler;
the pointer is arranged on the equal-arm lever ruler and is matched with the dial;
the measuring cup is positioned on one side of the overflow cup and is matched with the overflow cup.
2. The experimental device for scientific buoyancy measurement of primary school according to claim 1, wherein the lever ruler with equal arms comprises a base, a sleeve is fixedly installed at the top of the base, an adjusting rod is slidably installed in the sleeve, the lever ruler is rotatably installed on the adjusting rod, adjusting screws are fixedly installed at both ends of the lever ruler, balance nuts are arranged on the adjusting screws, a connecting rod is fixedly installed at the top of the adjusting rod, and a fixing rod is installed at the bottom of the connecting rod.
3. The experimental apparatus for measuring scientific buoyancy of an elementary school according to claim 2, wherein the top of the fixing rod is fixedly connected with the bottom of the connecting rod.
4. The experimental device for scientific buoyancy measurement in primary school according to claim 2, wherein a mounting hole is formed in one side of the adjusting rod, the lever ruler penetrates through the mounting hole and is rotatably mounted in the mounting hole, the adjusting rod is fixedly mounted on a rotating shaft, the rotating shaft is rotatably connected with inner walls of two sides of the mounting hole, one end of the rotating shaft extends to the outer side of the adjusting rod and is fixedly connected with the pointer, and the dial is fixedly connected with the sleeve.
5. The experimental device for measuring the scientific buoyancy of the primary school according to claim 2, wherein the inner walls of the two sides of the sleeve are respectively provided with a limiting groove, the two sides of the adjusting rod are respectively and fixedly provided with a limiting block, and the limiting blocks are connected with the corresponding inner walls of the limiting grooves in a sliding manner.
6. The experimental device for measuring scientific buoyancy of an elementary school according to claim 2, wherein a limiting shell is fixedly installed on one side of the sleeve, a brake rod is installed on the sleeve in a threaded manner, one end of the brake rod is in contact with the adjusting rod, and the other end of the brake rod penetrates through the limiting shell and is fixedly installed with a lifting handle.
7. The experimental device for measuring scientific buoyancy at an elementary school according to claim 6, wherein the limiting shell is provided with a through hole, and the brake rod penetrates through the through hole.
8. The experimental device for measuring scientific buoyancy at primary school according to claim 7, wherein a brake block fixedly sleeved outside the brake rod is arranged in the limiting shell, and the brake block is matched with the through hole.
9. The experimental apparatus for scientific buoyancy measurement in primary school according to claim 2, wherein the fixing rod penetrates through and is slidably connected with the connecting rod, and a butterfly zero adjusting nut is screwed on the outer side of the fixing rod and is located above the connecting rod.
10. The experimental apparatus for scientific buoyancy measurement of primary school according to claim 9, wherein sliding grooves are formed on both sides of the fixing rod, sliding blocks fixedly connected with the connecting rod are arranged on both sides of the fixing rod, and the sliding blocks are slidably connected with the inner walls of the corresponding sliding grooves.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911318976.2A CN110942701A (en) | 2019-12-19 | 2019-12-19 | Experimental apparatus is measured to primary school's science buoyancy |
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| CN201911318976.2A CN110942701A (en) | 2019-12-19 | 2019-12-19 | Experimental apparatus is measured to primary school's science buoyancy |
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