How to do experiments to explore the laws of physics?

There are too many copies upstairs...

To put it simply, law refers to the inevitability of a certain cause causing a certain result.

So the method is usually the control variable method.

That is to say, if you think that a certain result is caused by a certain reason, then you can construct multiple experiments so that the cause is different but the other factors are the same, and if multiple experiments can get different results, then you can summarize the law from cause to effect.

Ask questions, make hypotheses, design experiments, conduct experiments, draw results, test hypotheses, and draw conclusions. Explain that to learn physics, you should observe carefully. Hands-on.

When the famous physicist Galileo Galilei was a student at the University of Pisa, his first important scientific discovery of the law of oscillation was made. At one point he noticed that the chandelier on the church was constantly swinging because of the wind. Although the chandelier swings less and less, each swing seems to be equal in time.

Seven Steps in Physical Research Experiments:

1. Ask questions.

2. Conjecture or hypothesis.

3. Design experiments.

4. Conduct experiments.

5. Analysis and argumentation.

Zhifeng 6, draw the theory of knotting the spine.

7. Evaluate the flow of cherry blossoms.

**Experiment refers to a cognitive activity in which the experimenter draws conclusions through his own experiments, explorations, analysis, and research without knowing the experimental results, so as to form scientific concepts.

Physical experiments are the scientific method of observing, measuring, and verifying physical phenomena and laws by designing and conducting experiments. It is an important tool for the study of physics.

There are various methods for the experiment, and the appropriate method can be selected according to the purpose of the experiment and the specific situation. Here are some common methods for physics experiments:

Contact method: by touching or connecting the experimental equipment and the object to be measured, such as using electrodes to measure resistance, using a thermometer to measure temperature, etc.

Push-pull method: the balance of the force and the relationship between the magnitude of the force, such as using a spring to determine the force constant, using a balance to determine the mass of an object, etc.

Observation method: Observe and record experimental phenomena with the naked eye or a microscope and other instruments, such as observing the diffraction and interference of light, observing the surface tension of liquids, etc.

Measurement method: Measure physical quantities through instruments and equipment, such as measuring current with an electricity meter, measuring the frequency of light with a spectrometer, etc.

Experimental design method: through the design of multiple experimental conditions and comparative analysis, verify the laws of physics or unknown laws, such as designing experiments to verify the law of conservation of momentum, designing experiments to study the relationship between resistance and current, etc.

2.Application of knowledge points:

Physics experimental methods are widely used in physics teaching, scientific research, and engineering applications. Through experimental methods, physical phenomena can be observed, physical theories and laws can be verified, experimental data support can be provided, and students' practical ability and scientific thinking can be cultivated.

3.Explanation of knowledge points and example questions:

Example: Design a physics experiment to study the effect of gravity on an object.

Answer: Design a simple experiment to study the effect of gravity on an object through a free-fall experiment. The following is a possible experimental procedure:

1.Prepare an upright vertical measuring scale and secure it to the vertical wall.

2.Place a small ball at the bottom of the ruler that can fall freely.

3.Set the start and end points, with the start point being where the ball leaves the finger and the end point being where the ball stops after hitting the ground.

4.Repeat the experiment and record the time of the spheroid free fall for each experiment.

5.Using the basic formula of free fall motion h = 1 2 * g * t 2, where h is the height, g is the gravitational acceleration, and t is the time, the experimental gravitational acceleration is calculated by measuring the time and the known height.

6.The results of each experiment were compared to calculate the average value of the acceleration due to gravity.

With this experiment, it is possible to verify the effect of gravity on the object and measure the magnitude of the acceleration due to gravity.

Question: What factors are related to loudness?

Experiments and Observations].

Hang the table tennis ball with a thin wire so that the table tennis ball is still in an upright position, in contact with one of the forks of the tuning fork. Tap the tuning fork first, then tap the tuning fork again, and observe the amplitude of the ping-pong ball being bounced off.

Experimental results] The loudness of the sound produced by the tuning fork is small, the amplitude of the vibration of the tuning fork is small, and the amplitude of the table tennis ball being bounced is small. The loudness of the sound emitted by the tuning fork is large, the amplitude of the vibration of the tuning fork is large, and the amplitude of the ping-pong ball being bounced apart is large.

Experimental conclusion] The loudness is related to the amplitude of the vibration of the emitter, and the greater the amplitude of the vibration of the object, the greater the loudness of the sound.

Analysis and Interpretation].

In addition to the amplitude of the vibration of the emitter, loudness is also related to the distance between the listener and the emitter. That is, the farther away from the emitter, the smaller the sound is heard, and the less loud it is (reason: because the sound is dispersed the farther away as it travels. ）。

Conclusions based on the above].

Loudness is related to the amplitude of the emitter and the distance from the emitter. At the same distance, the greater the amplitude, the louder it is. Similarly, with the same amplitude, the farther away from the emitter, the smaller the sound heard and the less loud it is.

I hope it helps you, and if you have any questions, you can ask them

I wish you progress in your studies and go to the next level! (*

The main methods of physical experiments are:

1) Equivalence (substitution);

2) Establish an ideal model method;

3) control variable method;

4) Experimental reasoning;

5) conversion method;

5) Analogy, etc.

The methods of physical experiments** are: control variable method, transformation method, analogy method, ideal model method, and indirect measurement method.

Discoveries, hypotheses, experiments, conclusions (and so it is for the most part).

Computer modeling! Mathematical modeling!!

(1) Pinch the mineral water bottle hard, the bottle will be deformed; Illustrates that force is capable of changing the shape of an object;

2) Release the hand that holds the bottle, the bottle will fall; It shows that the bottle is affected by gravity, and the direction of gravity is vertically downward;

3) Throw the bottle out, and continue to move forward after the bottle leaves the hand; It is because it is affected by inertia;

4) Observe the words in the textbook through the bottle, and the characters become larger; It is due to convex lens imaging;

5) prick several small holes of different heights in the bottle, and the speed of water flowing out from the small holes is different; Explain that the pressure of the liquid is related to the depth

So the answer is: the main experimental process.

** Physical issues.

Example with a portable mineral water bottle, feel heavy.

The action of force is reciprocal.

Experiment 1: Pinch the bottle hard enough to deform.

Force can change the shape of an object.

Test 2: Grab the hand of the bottle and let go of the bottle, and the bottle will fall.

The object is subjected to gravity.