Give a couple of junior physics experiments. It is necessary to have the name of the experiment, the

Name of the experiment Instruments and materials used.

The production and propagation of sound Tuning fork (one), vacuum hood (a large set) How do we hear sound Ear model, tuning fork.

Quality Student Balances.

Characteristics of sound Levers, steel rulers.

Measure the density of an object in a cylinder group.

Reflection of Light Reflection of Light Demonstrator.

Planar Mirror Imaging Planar Mirror Imaging Demonstrator.

Length Scale, vernier caliper, spiral micrometer.

Refraction of light, dispersion of light Glass bricks, prisms.

Newton's First Law Bar magnets, inclined trolleys and accessories.

Two forces balance trolley, hook code.

Convex lens imaging experiment light holder (one set), candle.

Elasticity, spring dynamometer, gravity plate dynamometer, spring.

Thermometer Thermometer, heat and cold meter, laboratory thermometer.

Melting and solidification The melting demonstrator of naphthalene solidifies.

Friction Friction demonstrator.

Lever balance conditions Hook yard, vinegar rod, iron frame.

Simple mechanical pulley block (one set).

Boiling iron stands, laboratory thermometers.

Sublimation and Agglomeration Iodine Sublimation Agglomerate Demonstrator.

Charge electroscope, rubber rod, glass rod.

Pressure Pressure Pressure Demonstrator.

Liquid Pressure Liquid Pressure Demonstrator.

Current & Circuits Micro Piezometer.

Current law in series and parallel thousand battery switches, ammeters, bulbs, wires.

Atmospheric pressure Torricelli Experimental Demonstrator, Magdeburg Hemisphere.

Buoyancy spring scale, beaker.

Home circuits energy meters.

Preliminary knowledge of measurement, measuring the length with a millimeter scale, measuring the average speed of linear motion with variable speed, the vibration and sound of objects, the propagation of sound by the medium, the relationship between tone and frequency, the relationship between loudness and amplitude, thermometer, thermometer, measuring the temperature of water with a thermometer, melting of crystals and amorphous amorphous, evaporation and endothermy, the temperature remains unchanged during water boiling, observing the boiling of water, compression volume, gas liquefaction, sublimation and condensation of iodine, etc.

These things are only effective when you do them yourself.

In physical research, there are many concepts, laws, and conclusions that are based on physical experiments, but there are also many experiments that are difficult to achieve due to the limitations of actual conditions, so it is necessary to draw conclusions about ideal experiments on the basis of a large number of reliable experimental facts and through scientific reasoning, and this process and method is the method of experimental reasoning.

On the basis of Galileo's ideal experiment, Newton further analyzed and reasoned about the process according to the laws of logic, and found out its laws, resulting in the famous Newton's first law. Therefore, although this law cannot be directly verified by experiments, it is a law obtained through reasoning on the basis of experiments. This law clarifies the relationship between force and motion.

This is also the case when a vacuum cannot transmit sound. Since the vacuum cannot reach the absolute vacuum, it is inferred on the basis of experiments that if the air in the bottle is pumped into a vacuum, the ** sound will not be heard, and the conclusion that the sound cannot be transmitted in the vacuum can be deduced.

There should be many, 1In the acoustic phenomenon, the vacuum cannot transmit sound, that is, on the basis of experiments, the vacuum hood takes time to listen to the sound of the alarm clock, and in the end it is only getting smaller and smaller, and it is impossible to achieve a vacuum, so it is inferred that the vacuum cannot transmit sound.

2.Newton's first law is the same, the experiment can only do the car to the resistance is getting smaller and smaller, how can there be no external force, so on the basis of experiments, it can only be inferred that all objects always maintain a uniform linear motion or a state of rest when they are not affected by any force

What is the magnitude of sliding friction related to?

Experimental reasoning, and Newton's first law.

1. Measure the length with a scale.

2. Determine the average speed.

3. The generation and propagation of sound.

4. What is the loudness related to.

5. The law of light reflection.

6. Characteristics of plane mirror imaging.

7. Mixing of color and light and mixing of pigments.

8. Characteristics of convex lens imaging.

9. The relationship between the mass and volume of a substance.

10. Measure the density of solids and liquids with a balance and a graduated cylinder.

11. Measure the force with a spring dynamometer.

12. What factors are related to the magnitude of gravity?

13. What factors are related to the magnitude of friction.

14. The effect of resistance on the motion of an object.

15. Conditions for the balance of two forces.

16. What factors are related to the effect of pressure?

17. The relationship between fluid pressure and flow velocity.

18. What is the magnitude of buoyancy?

19. What factors are related to the magnitude of kinetic energy.

20. What factors are related to the magnitude of gravitational potential energy.

21. Equilibrium conditions for leverage.

22. Compare the characteristics of fixed pulley and movable pulley.

23. The mechanical efficiency of the inclined plane.

24. Measure the temperature of water with a thermometer.

25. The temperature change law when the solid is melted.

26. The boiling of water.

27. Compare the endothermic capacity of different substances.

28. The law of current in series and parallel circuits.

29. The law of voltage in series and parallel circuits.

30. Use a sliding rheostat to change the brightness of the bulb.

31. The relationship between the current on the resistor and the voltage and resistance.

32. Use voltmeter and ammeter to measure resistance.

33. The relationship between electrical work and voltage, current and energizing time.

34. Measure the electrical power of the small bulb.

35. The magnetic field of the energized solenoid is obtained.

36. Research electromagnets.

37. Under what circumstances can magnetism generate electricity?

When I first took the exam, there were twenty experiments.

1. Equilibrium conditions for leverage.

2. Measure the density of the liquid with a balance and a measuring cylinder.

3. What factors are related to the magnitude of gravity?

4. The relationship between the current on the resistance and the resistance.

5. Determine the rated power of the small bulb.

6. Determine the average speed.

7. Characteristics of plane mirror imaging.

8. Use a sliding rheostat to change the current.

9. Characteristics of current in series circuit.

10. Mechanical efficiency of the inclined plane.

11. Use voltmeter and ammeter to measure resistance.

12. Characteristics of convex lens imaging.

13. Research on electromagnets.

14. Compose a parallel circuit.

15. Use a voltmeter to measure the voltage in the series circuit.

16. Characteristics of current in parallel circuits.

17. Measure the temperature of water with a thermometer.

18. Measure the force with a spring dynamometer.

19. Use a voltmeter to measure the voltage in the parallel circuit.

20. Measure the length with a scale.

Experiments on atmospheric pressure.

Principle: There is atmospheric pressure around the A4 paper. The atmospheric pressure acts vertically on the surface of the A4 paper, so that it is tightly pressed against the tabletop, and the larger the surface area, the greater the atmospheric pressure is subjected to the rattle.

The various striking forces in the experiment were not enough to overcome the atmospheric pressure, so the A4 paper was not cocked by the ruler. But when the force of the blow is large enough to exceed the atmospheric pressure to which the A4 paper is subjected, the ruler will fall.

Expansion: Atmospheric pressure is the atmospheric pressure acting on a unit area, that is, the gravitational force that is numerically equal to the vertical column of air that extends upward to the upper boundary of the atmosphere per unit area. The famous Magdeburg hemispheric experiment proves its existence.

The international unit of air pressure is Pascal, abbreviated as Pa, and the symbol is Pa. In meteorology, people generally use kilopascal (kpa) or hectopar (hpa) as the unit. The other commonly used single-yearling slots are:

bar (1 bar = 100,000 Pa) and a centimeter of mercury (or centimeters of mercury). Air pressure varies not only with altitude but also with temperature. Changes in air pressure are closely related to weather changes.

In 2011, the experimental ability of physics and chemistry of junior high school students in Jinan was examined.

Chemistry laboratory equipment and supplies.

Chemistry Question 1: Prepare 50 g of sodium chloride solution with a solute mass fraction of 4%.

First, the content of the experiment.

1.Weighing of sodium chloride solids and taking of water.

2.Prepare a sodium chloride solution.

2. Experimental supplies.

Medicine spoon, tray balance, 50ml (or 100ml) graduated cylinder, rubber tip dropper, beaker, glass rod, sodium chloride solution** container, waste tank, test tube brush.

Sodium chloride, distilled water, small pieces of paper of the same quality.

Chemistry Question 2: Preparation and collection of carbon dioxide.

First, the content of the experiment.

1.Carbon dioxide is produced by the reaction of limestone (or marble) and dilute hydrochloric acid.

2.Capture and filling of carbon dioxide.

2. Experimental supplies.

Large test tubes, small beakers, single-hole plugs with catheters, iron racks (with iron clips), tweezers, medicine spoons, gas collection cylinders, glass sheets, alcohol lamps, test tube brushes, waste tanks.

Limestone (or marble), dilute hydrochloric acid (1:4), matches, small sticks of wood.

Chemistry Question 3: Reaction of dilute sulfuric acid with copper oxide and reaction of sodium hydroxide solution with ferric chloride solution.

First, the content of the experiment.

1.Reaction of dilute sulfuric acid with copper oxide.

The solution reacts with the FeCl3 solution, and the resulting precipitate is checked to see if it reacts with dilute hydrochloric acid.

2. Experimental supplies.

Dry test tubes, test tube clamps, alcohol lamps, tweezers, medicine spoons, test tube brushes, waste tanks.

Dilute hydrochloric acid (1:4), dilute sulfuric acid, copper oxide powder, NaOH solution, FeCl3 solution, matches.

Question 4 Purify the yellow muddy water.

First, the content of the experiment.

1.Make a filter.

2.Filtering operations.

2. Experimental supplies.

Funnel, small beaker (two), glass rod, iron frame (with iron ring), rubber tip dropper, filter paper, scissors, test tube brush, waste tank.

Yellow mud water, distilled water.

Chemistry test question 5 Detection of acidity and alkalinity of NaOH solution, NaCl solution and HCL solution.

First, the content of the experiment.

1.The acidity and alkalinity of the three solutions were tested with litmus test solution or phenolphthalein test solution.

2.Determine the pH of the three solutions.

2. Experimental supplies.

Test tubes, test tube brushes, glass rods, beakers, filter paper, waste tanks.

Litmus solution, phenolphthalein solution, pH test paper, standard colorimetric card, NaOH solution, NaCl solution, HCl solution, distilled water.

Chemistry Question 6 Reaction of rusty iron nails with dilute hydrochloric acid, reaction of copper sulfate solution with iron.

First, the content of the experiment.

1.The effect of dilute hydrochloric acid with rusty nails.

2.Reaction of copper sulphate solution with iron.

2. Experimental supplies.

Dry test tubes, test tube clamps, alcohol lamps, tweezers, test tube brushes, beakers, waste tanks.

Dilute hydrochloric acid (1:4), rusty nails, copper sulphate solution, distilled water, fire.

Don't worry, super brain-dead, you can definitely pass it, just listen to the teacher's command.

Hook code, spring scale,

Correct first and then test.

Gravity and weight of the hook code

Up to 6. Don't forget to add data.

Cow's and 10 Cow's.

Depressed! Why don't you know anything, the teacher will tell you! Read more books and you will get by! And most importantly, don't be nervous.

There are many scientific methods for the study of physics, such as observation, experiment, comparison, analogy, equivalence, transformation, control variable, model, and scientific reasoning.