Come on for the back-to-school season
Physics experiments are a big challenge in the second year of high school, but with these five tricks, you will be able to easily deal with various problems and become a top student in seconds! Check it out!
1. Change your thinking and solve problems skillfully
When encountering physical quantities that are difficult to measure directly or physical phenomena that are difficult to display, the transformation thinking method is used to skillfully transform the problem and solve it easily.
Example 1: In the study of flat throwing motion, the initial velocity of flat throwing motion is indirectly obtained by measuring the horizontal displacement and vertical displacement of the object.
Example two: When studying linear motion at variable speeds, the velocity and acceleration of an object are derived from the displacement data.
Example three: When measuring the micro-deformation, the micro-deformation is transformed into an obvious phenomenon that is easy to observe by putting **, such as using the principle of light refraction to make a magnifying glass.
2. Compare thinking and find out the rules
By comparing physical phenomena under different conditions, revealing their essential laws, the problem can be solved.
Example 1: Compare the resistivity changes of different metals at different temperatures to reveal the relationship between metal conductivity and temperature.
Example two: Compare the process of flat throwing motion and free fall motion, and deeply understand the motion law of flat throwing motion in the vertical direction.
Example three: By comparing the thermal conductivity of different substances under the same conditions, the law and influencing factors of thermal conduction.
3. Alternative thinking, easy to solve
When encountering physical quantities or phenomena that are difficult to measure or observe directly, use alternative thinking methods to solve the problem indirectly.
Example 1: When studying the movement of a single pendulum, the displacement of the cardboard is used instead of time, simplifying the experimental measurement process.
Example two: By observing the degree of bending caused by thermal expansion and contraction of bimetal sheets, the temperature change can be judged to realize the substitution between physical phenomena.
Example threeIn the study of flat throwing motion, the flat throwing motion process is replaced by two sub-motion processes, the horizontal uniform motion and the vertical uniform linear motion, and the complex curved motion is transformed into a simple linear motion.
Fourth, approximate thinking, simplify
For some experiments with low precision requirements, the method of approximate processing is adopted to simplify the experimental process and draw conclusions quickly.
Example 1: In the gas experiment, the actual gas at room temperature and pressure is approximately treated as an ideal gas.
Example two: When measuring the gravitational acceleration with a single pendulum, the mass of the cycloid and the volume of the ball are ignored, and the "thin line and the small ball" are approximately studied as a single pendulum.
Example threeIn circuit analysis, ammeter and voltmeter are approximately treated as ideal instruments to simplify the circuit analysis and calculation process.
5. Accumulate thinking and reduce errors
The method of averaging multiple measurements is used to reduce the influence of accidental factors on the experimental results, and improve the accuracy and reliability of the experiment.
Example 1: When measuring the single pendulum period, the method of averaging after measuring the total time of multiple cycles is used to improve the measurement accuracy.
Example two: When measuring small lengths, the measurement error is reduced by taking multiple measurements and averaging to improve the accuracy of the measurement results.
Example three: When determining the density of liquids, the experimental error is reduced by taking multiple samples and averaging them after measuring their mass and volume.
Now it's your turn to show off! Have you ever encountered a similar problem in a physics experiment? How do you use these five thinking tools to solve problems? Welcome to leave a message in the comment area to share your experience and experience! At the same time, if you have any other questions or confusions about physics experiments, please feel free to raise them, and let's solve them together!